List of gravitational wave observations

Last updated
The first measurement of a gravitational wave event LIGO measurement of gravitational waves.svg
The first measurement of a gravitational wave event

This page contains a list of observed and candidate gravitational wave events.

Contents

Origin and nomenclature

Direct observation of gravitational waves, which commenced with the detection of an event by LIGO in 2015, [1] plays a key role in gravitational wave astronomy. LIGO has been involved in all subsequent detections to date, with Virgo joining in August 2017. [2]

Joint observation runs of LIGO and Virgo, designated "O1, O2, etc." span many months, with months of maintenance and upgrades in-between designed to increase the instruments sensitivity and range. Within these run periods, the instruments are capable of detecting gravitational waves.

The first run, O1, ran from September 12, 2015, to January 19, 2016, and succeeded in its first gravitational wave detection. O2 ran for a greater duration, from November 30, 2016, to August 25, 2017. [3] O3 began on April 1, 2019. The observing run was split in two, designated "O3a" and "O3b" with the first part suspended on September 30, 2019, for maintenance and upgrades. O3b began on November 1, 2019. Due to the COVID-19 pandemic [4] O3 was forced to end prematurely. [5] The early end meant that KAGRA did not have chance to participate in joint observations with LIGO and Virgo, so a short joint run was done in partnership with GEO. This run was designated "O3GK", and did not result in any additional detections. [6]

O4 began on May 24, 2023; initially planned for March, the project needed more time to stabilize the instruments. The fourth observing run has been divided into three parts so far, designated "O4a", "O4b", and "O4c". The run, initially planned to end after one year, has been extended, following plans to make further upgrades for the O5 run. [2] [7] O4a started May 24, 2023 and ended January 16, 2024. O4b started April 10, 2024 and ended January 28, 2025 at 17:00 UTC. Unusually, O4c, followed directly from O4b, starting on January 28, 2025 at 17:00 UTC and is planned to continue to November 18, 2025. Updated observing plans are published on the official website, containing the latest information on these runs. [7] There was a two month commissioning break from January to March 2024, and another from 1 April to a planned 11 June 2025, after which observations resumed. [8] As of May 2025, O5 is planned to begin in late 2027.

Gravitational wave events are named starting with the prefix GW, while observations that trigger an event alert but have not (yet) been confirmed are named starting with the prefix S. [9] Six digits then indicate the date of the event, with the two first digits representing the year, the two middle digits the month and two final digits the day of observation. This is similar to the systematic naming for other kinds of astronomical event observations, such as those of gamma-ray bursts.

Probable detections that are not confidently identified as gravitational wave events are designated LVT ("LIGO-Virgo trigger"). Known gravitational wave events come from the merger of two black holes (BH), two neutron stars (NS), or a black hole and a neutron star (BHNS). [10] [11] Some objects are in the mass gap (MG) between the largest predicted neutron star masses (Tolman–Oppenheimer–Volkoff limit) and the smallest known black holes.

List of gravitational wave events

Confirmed events by distance
4
8
12
16
20
24
28
32
36
40
<100 Mpc
100-200 Mpc
200-500 Mpc
500-1000 Mpc
1-2 Gpc
2-5 Gpc
5+ Gpc
  •   BNS mergers
  •   NS-BH mergers
  •   mass gap
  •   BBH mergers
Initial objects by mass
5
10
15
20
25
30
35
40
45
50
1-2 M
2-3 M
3-5 M
5-10 M
10-20 M
20-30 M
30-40 M
40-50 M
50-60 M
60-70 M
70-80 M
80-90 M
90-100 M
100-110 M
  •   neutron star
  •   mass gap
  •   black hole
List of binary merger events [12] [13]
GW event
and time (UTC) [n 1]
Date
published
Location
area [n 2]
(deg2)
Signal to
Noise Ratio
(SNR)
Luminosity
distance

(Mpc) [n 3]
Energy
radiated/c 2
(M)
[n 4]
Chirp mass (M)
[n 5]
Effective spin [n 6] PrimarySecondaryRemnantNotesRef.
TypeMass (M)TypeMass (M)TypeMass (M) Spin [n 7]
GW150914
09:50:45
2016-02-11
179; mostly to the south
24.4+0.8
−0.8
430+150
−170
3.1+0.4
−0.4
28.6+1.6
−1.5
−0.01+0.12
−0.13
BH
[n 8]
35.6+4.8
−3.0
BH
[n 9]
30.6+3.0
−4.4
BH
63.1+3.3
−3.0
0.69+0.05
−0.04
First GW detection;
first BH merger observed
[19] [20] [18]
GW151012  [ fr ]
09:54:43
2016-06-15
1555
10.0+0.5
−0.5
1060+540
−480
1.5+0.5
−0.5
15.2+2.0
−1.1
0.04+0.28
−0.19
BH
23.3+14.0
−5.5
BH
13.6+4.1
−4.8
BH
35.7+9.9
−3.8
0.67+0.13
−0.11
Formerly candidate LVT151012;
accepted as astrophysical since February 2019
[21] [13] [12]
GW151226
03:38:53
2016-06-15
1033
13.1+0.0
−1.2
440+180
−190
1.0+0.1
−0.2
8.9+0.3
−0.3
0.18+0.20
−0.12
BH
13.7+8.8
−3.2
BH
7.7+2.2
−2.6
BH
20.5+6.4
−1.5
0.74+0.07
−0.05
[22] [23]
GW170104
10:11:58
2017-06-01
924
13.0+0.0
−0.0
960+430
−410
2.2+0.5
−0.5
21.5+2.1
−1.7
−0.04+0.17
−0.20
BH
31.0+7.2
−5.6
BH
20.1+4.9
−4.5
BH
49.1+5.2
−3.5
0.66+0.08
−0.10
[14] [24]
GW170608
02:01:16
2017-11-16
396; to the north
14.9+0.5
−0.8
320+120
−110
0.9+0.0
−0.1
7.9+0.2
−0.2
0.03+0.19
−0.07
BH
10.9+5.3
−1.7
BH
7.6+1.3
−2.1
BH
17.8+3.2
−0.7
0.69+0.04
−0.04
Smallest BH progenitor
masses to date
[25]
GW170729
18:56:29
2018-11-30
1033
10.2+0.6
−0.4
2750+1350
−1320
4.8+1.7
−1.7
35.7+6.5
−4.7
0.36+0.21
−0.25
BH
50.6+16.6
−10.2
BH
34.3+9.1
−10.1
BH
80.3+14.6
−10.2
0.81+0.07
−0.13
Largest progenitor masses until GW190521 [13]
GW170809
08:28:21
2018-11-30
340; towards Cetus
12.4+0.0
−0.2
990+320
−380
2.7+0.6
−0.6
25.0+2.1
−1.6
0.07+0.16
−0.16
BH
35.2+8.3
−6.0
BH
23.8+5.2
−5.1
BH
56.4+5.2
−3.7
0.70+0.08
−0.09
[13]
GW170814
10:30:43
2017-09-27
87; towards Eridanus
16.3+0.9
−0.4
580+160
−210
2.7+0.4
−0.3
24.2+1.4
−1.1
0.07+0.12
−0.11
BH
30.7+5.7
−3.0
BH
25.3+2.9
−4.1
BH
53.4+3.2
−2.4
0.72+0.07
−0.05
First announced detection by
three observatories; first polarization measurement
[26] [27]
GW170817
12:41:04
2017-10-16
33.0+0.0
−2.1
40±10
 0.04
1.186+0.001
−0.001
0.00+0.02
−0.01
NS
1.46+0.12
−0.10
NS
1.27+0.09
−0.09
HMNS-BH
[n 10]
 2.8 [n 11]
 0.89
First NS merger observed in
GW; first detection of EM counterpart (GRB  170817A; AT  2017gfo); nearest event to date
[17] [31] [32]
GW170818
02:25:09
2018-11-30
39; towards Pegasus
11.3+0.0
−0.0
1020+430
−360
2.7+0.5
−0.5
26.7+2.1
−1.7
−0.09+0.18
−0.21
BH
35.5+7.5
−4.7
BH
26.8+4.3
−5.2
BH
59.8+4.8
−3.8
0.67+0.07
−0.08
[13]
GW170823
13:13:58
2018-11-30
1651
11.1+0.4
−0.3
1850±840
3.3+0.9
−0.8
29.3+4.2
−3.2
0.08+0.20
−0.22
BH
39.6+10.0
−6.6
BH
29.4+6.3
−7.1
BH
65.6+9.4
−6.6
0.71+0.08
−0.10
[13]
GW190403_051519
2019-04-03 05:15:19
2022-05-11
3900
7.6+0.6
−1.1
8300+6700
−4300
34.0+15.1
−8.4
0.68+0.16
−0.43
BH
85.0+6.7
−4.3
BH
20.0+26.3
−8.4
BH
102+26
−24
0.91+0.05
−0.17
[33]
GW190408_181802
2019-04-08 18:18:02
2020-10-27
140
15.3+0.2
−0.3
1580+400
−590
18.3+1.4
−1.2
−0.03+0.13
−0.19
BH
24.5+5.1
−3.4
BH
18.3+3.2
−3.5
BH
41.0+3.8
−2.7
0.67+0.06
−0.07
Originally designated S190408an. [34]
GW190412
2019-04-12
05:30:44
2020-04-17
156; towards Virgo or Boötes
18.9+0.2
−0.3
730+140
−170
13.3+0.4
−0.3
0.25+0.08
−0.11
BH
29.7+5.0
−5.3
BH
8.4+1.8
−1.0
BH
37.0+4.1
−3.9
0.67+0.05
−0.07
First possible observation of a merger of two black holes of very different masses. Originally designated S190412m. [35] [36]
GW190413_052954
2019-04-13
2020-10-27
1400
8.9+0.4
−0.7
4100+2410
−1890
24.0+5.4
−3.7
0.01+0.29
−0.33
BH
33.4+12.4
−7.4
BH
23.4+6.7
−6.3
BH
54.3+12.4
−8.4
0.69+0.12
−0.13
[34]
GW190413_134308
2019-04-13
2020-10-27
520
10.0+0.4
−0.5
5150+2440
−2340
31.9+7.3
−4.6
−0.01+0.24
−0.28
BH
45.4+13.6
−9.6
BH
30.9+10.2
−9.6
BH
72.8+15.2
−10.3
0.69+0.10
−0.12
[34]
GW190421_213856
2019-04-21
2020-10-27
1000
10.7+0.2
−0.4
3150+1370
−1420
30.7+5.5
−6.6
−0.05+0.23
−0.26
BH
40.6+10.4
−6.6
BH
31.4+7.5
−8.2
BH
68.6+11.7
−8.1
0.68+0.10
−0.11
Originally designated S190421ar. [34]
GW190424_180648
2019-04-24 18:06:48
2020-10-27
26000
10.4+0.2
−0.4
2550+1560
−1330
30.3+5.7
−4.2
0.15+0.22
−0.22
BH
39.5+10.9
−6.9
BH
31.0+7.4
−7.3
BH
67.1+12.5
−9.2
0.75+0.08
−0.09
[34]
GW190425
2019-04-25
08:18:05
2020-01-06
430; towards Hercules [37]
12.4+0.3
−0.4
159+69
−72
1.44+0.02
−0.02
0.012+0.01
−0.01
NS
1.60 - 1.87
NS
1.46 - 1.69
?
Originally designated S190425z (z:26th trigger|UTC day), this trigger was detected by a single LIGO instrument (of three LVC stations), and is considered by some scientists to have been confirmed as a binary neutron star merger. [38]

It was published in 2020 that a gamma-ray burst was detected (GRB 190425) ~0.5 seconds after the LIGO trigger, lasting 6 seconds and bearing similarities to GRB170817 (such as weakness [most power in sub-100 keV, or soft X-rays) bands], elevated energetic photon background levels [signal exceeding background by less than a factor of 2], and similar differences from other transients classified as short GRBs). Confidence was established for interpretation of a set of peaks through a control interval of only 2 days prior to the LIGO-Livingston trigger in INTEGRAL Electronic anticoincidence, could not be corroborated by other instruments and wasn't initially noted as a significant event. Non-detection in other instruments may be a consequence of an Earth-occulted source as the Fermi telescope attempted follow-up. [37]

[39] [40]
GW190426_152155
2019-04-26
15:21:55
2020-10-27
1300
8.7+0.5
−0.6
370+180
−160
2.41+0.08
−0.08
−0.03+0.32
−0.30
BH?
5.7+3.9
−2.3
NS
1.5+0.8
−0.5
BH?
The primary object, being between 3.4 and 9.6 solar masses, is either a black hole or an object in the mass gap. Originally designated S230426c. [34]
GW190426_190642
2019-04-26
19:06:42
2022-05-11
4600
8.7+0.4
−0.6
4600+3400
−2300
76.0+19.1
−17.4
0.23+0.42
−0.41
BH
106+45
−24
BH
76+26
−36
BH
173+38
−34
0.77+0.14
−0.16
[33]
GW190503_185404
2019-05-03
18:54:04
2020-10-27
94; towards Columba, Pictor, or Puppis
12.4+0.2
−0.3
1450+690
−630
30.2+4.2
−4.2
−0.03+0.20
−0.26
BH
43.3+9.1
−8.2
BH
28.4+7.7
−8.0
BH
68.6+8.8
−7.7
0.66+0.09
−0.12
Originally designated S230503bf. [34]
GW190512_180714
2019-05-12
18:07:14
2020-10-27
220; towards Scorpius or Ophiuchus
12.2+0.2
−0.4
1430+550
−550
14.6+1.3
−1.0
0.03+0.12
−0.13
BH
23.3+5.3
−3.8
BH
12.6+3.6
−2.5
BH
34.5+3.8
−3.5
0.65+0.07
−0.07
Originally designated S230512at. [34]
GW190513_205428
2019-05-13
20:54:28
2020-10-27
12.9+0.3
−0.4
2060+880
−800
21.6+3.8
−1.9
0.11+0.28
−0.17
BH
35.7+9.5
−9.2
BH
18.0+7.7
−4.2
BH
51.6+8.2
−5.8
0.68+0.14
−0.12
Originally designated S230513bm. [34]
GW190514_065416
2019-05-14
06:54:16
2020-10-27
3000
8.2+0.3
−0.6
4100+2700
−2200
28.5+7.9
−4.8
−0.19+0.29
−0.32
BH
39.0+14.7
−8.2
BH
28.4+9.3
−8.8
BH
65+18
−10
0.63+0.11
−0.15
[34]
GW190517_055101
2019-05-17
06:54:16
2020-10-27
470
10.7+0.4
−0.6
1860+1620
−840
26.6+4.0
−4.0
0.52+0.19
−0.19
BH
37.4+11.7
−7.6
BH
25.3+7.0
−7.3
BH
59.3+9.1
−8.9
0.87+0.05
−0.07
Originally designated S190517h. [34]
GW190519_153544
2019-05-19
15:35:44
2020-10-27
860
15.6+0.2
−0.3
2530+1830
−920
44.5+6.4
−7.1
0.31+0.20
−0.22
BH
66+11
−12
BH
41+11
−11
BH
101+12
−14
0.79+0.07
−0.13
Originally designated S190519bj. [34]
GW190521
2019-05-21
03:02:29
2020-09-02
14.2+0.3
−0.3
5300+2400
−2600
7.6+2.2
−1.9
64+13
−8
0.08+0.27
−0.36
BH
85+21
−14
BH
66+17
−18
BH
142+28
−16
0.72+0.09
−0.12
Originally designated S190521g. Largest progenitor masses to date. [41] [42]
GW190521_074359
2019-05-21
07:43:59
2020-10-27
550
25.8+0.1
−0.2
1240+400
−570
32.1+3.2
−2.5
0.09+0.10
−0.13
BH
42.2+5.9
−4.8
BH
32.8+5.4
−6.4
BH
71.0+6.5
−4.4
0.72+0.05
−0.07
Originally designated S190521r. [34]
GW190527_092055
2019-05-27
09:20:55
2020-10-27
3700
8.1+0.3
−0.9
2500+2500
−1200
24.3+9.2
−4.1
0.11+0.28
−0.28
BH
36.5+16.4
−9.0
BH
22.6+10.5
−8.1
BH
56.4+20.2
−9.3
0.71+0.12
−0.16
[34]
GW190602_175927
2019-06-02
17:59:27
2020-10-27
690
12.8+0.2
−0.3
2700+1800
−1100
49.1+9.1
−8.5
0.07+0.25
−0.24
BH
69+16
−13
BH
48+14
−17
BH
111+18
−15
0.70+0.10
−0.14
Originally designated S190602aq. [34]
GW190620_030421
2019-06-20
03:04:21
2020-10-27
7200
12.1+0.3
−0.4
2800+1700
−1300
38.3+8.3
−6.5
0.33+0.22
−0.25
BH
57+16
−13
BH
36+12
−12
BH
87+17
−12
0.79+0.08
−0.15
[34]
GW190630_185205
2019-06-30
18:52:05
2020-10-27
1200
15.6+0.2
−0.3
890+560
−370
24.9+2.1
−2.1
0.10+0.12
−0.13
BH
35.1+6.9
−5.6
BH
23.7+5.2
−5.1
BH
56.4+4.4
−4.6
0.70+0.05
−0.07
Originally designated S190630ag. [34]
GW190701_203306
2019-07-01
20:33:06
2020-10-27
46; towards Eridanus or Cetus
11.3+0.2
−0.3
2060+760
−730
40.3+5.4
−4.9
−0.07+0.23
−0.29
BH
53.9+11.8
−8.0
BH
40.8+8.7
−12.0
BH
90.2+11.3
−8.9
0.66+0.09
−0.13
Originally designated S190701ah. [34]
GW190706_222641
2019-07-06
22:26:41
2020-10-27
650
12.6+0.2
−0.4
4400+2600
−1900
42.7+10.0
−7.0
0.28+0.26
−0.29
BH
67+15
−16
BH
38+15
−13
BH
99+18
−14
0.78+0.09
−0.18
Originally designated S190706ai. [34]
GW190707_093326
2019-07-07
09:33:26
2020-10-27
1300
13.3+0.2
−0.4
770+380
−270
8.5+0.7
−0.6
−0.05+0.10
−0.08
BH
11.6+3.3
−1.7
BH
8.4+1.4
−1.7
BH
19.2+1.9
−1.3
0.66+0.03
−0.04
Originally designated S190707q. [34]
GW190708_232457
2019-07-08
23:24:57
2020-10-27
14000
13.1+0.2
−0.3
880+330
−390
13.2+0.9
−0.6
0.02+0.08
−0.10
BH
17.6+4.7
−2.3
BH
13.2+2.0
−2.7
BH
29.5+2.5
−1.8
0.69+0.04
−0.04
[34]
GW190719_215514
2019-07-09
21:55:14
2020-10-27
2900
8.3+0.3
−0.8
3900+2600
−2000
23.5+6.5
−4.0
0.32+0.29
−0.31
BH
37+18
−10
BH
20.8+9.0
−7.2
BH
55+17
−10
0.78+0.11
−0.17
[34]
GW190720_000836
2019-07-20
00:08:36
2020-10-27
460; mostly towards Cygnus
11.0+0.3
−0.7
790+690
−320
8.9+0.5
−0.8
0.18+0.14
−0.12
BH
13.4+6.7
−3.0
BH
7.8+2.3
−2.2
BH
20.4+4.5
−2.2
0.72+0.06
−0.05
Originally designated S190720a. [34]
GW190725_174728
2019-07-25
17:47:28
2022-05-11
2200
9.1+0.4
−0.7
1030+520
−430
7.4±0.5
−0.04+0.36
−0.16
BH
11.8+10.1
−3.0
BH?
6.3+2.1
−2.5
BH
17.6+7.7
−1.8
0.65+0.09
−0.07
[33]
GW190727_060333
2019-07-27
06:03:33
2020-10-27
830
11.9+0.3
−0.5
790+690
−320
28.6+5.3
−3.7
0.11+0.26
−0.25
BH
38.0+9.5
−6.2
BH
29.4+7.1
−8.4
BH
63.8+10.9
−7.5
0.73+0.10
−0.10
Originally designated S190727h. [34]
GW190728_064510
2019-07-28
06:45:10
2020-10-27
400
13.0+0.2
−0.4
870+260
−370
8.6+0.5
−0.3
0.12+0.20
−0.07
BH
12.3+7.2
−2.2
BH
8.1+1.7
−2.6
BH
19.6+4.7
−1.3
0.71+0.04
−0.04
Originally designated S190728q. [34]
GW190731_140936
2019-07-31
14:09:36
2020-10-27
3400
8.7+0.2
−0.5
3300+2400
−1700
29.5+7.1
−5.2
0.06+0.24
−0.24
BH
41.5+12.2
−9.0
BH
28.8+9.7
−9.5
BH
67+15
−11
0.70+0.10
−0.13
[34]
GW190803_022701
2019-08-03
02:27:01
2020-10-27
1500
8.6+0.3
−0.5
3300+2000
−1600
27.3+5.7
−4.1
−0.03+0.24
−0.27
BH
37.3+10.6
−7.0
BH
27.3+7.8
−8.2
BH
61.7+11.8
−8.5
0.68+0.10
−0.11
[34]
GW190805_211137
2019-08-05
21:11:37
2022-05-11
1600
8.1+0.5
−0.7
6100+3700
−3100
31.9+8.8
−6.3
0.37+0.29
−0.39
BH
46+15
−11
BH
31+12
−11
BH
72+18
−13
0.82+0.09
−0.16
[33]
GW190814 2019-08-14 21:11:182020-06-23
18.5; towards Cetus or Sculptor [ citation needed ]
24.9+0.1
−0.2
241+41
−45
6.09+0.06
−0.06
−0.002+0.06
−0.061
BH
23.2+1.1
−1.0
MG
2.59+0.08
−0.09
BH
25.6+1.1
−0.9
0.28+0.02
−0.02
No optical counterpart was discovered despite an extensive search of the probability region. The mass of the lighter component is estimated to be 2.6 times the mass of the Sun, placing it in the mass gap between neutron stars and black holes. [43] [44] [45] [46] [47] [48]
[49] [50] [51] [52]
GW190828_063405
2019-08-28
06:34:05
2020-10-27
520
16.2+0.2
−0.3
2130+660
−930
25.0+3.4
−2.1
0.19+0.15
−0.16
BH
32.1+5.8
−4.0
BH
26.2+4.6
−4.8
BH
54.9+7.2
−4.3
0.75+0.06
−0.07
Originally designated S190828j. [34]
GW190828_065509
2019-08-28
06:55:09
2020-10-27
660
10.0+0.3
−0.5
1600+620
−600
13.3+1.2
−1.0
0.08+0.16
−0.16
BH
24.1+7.0
−7.2
BH
10.2+3.6
−2.1
BH
33.1+5.5
−4.5
0.65+0.08
−0.08
Originally designated S190828l. [34]
GW190909_114149
2019-09-09
11:41:49
2020-10-27
4700
8.1+0.4
−0.6
3800+3300
−2200
30.9+17.2
−7.5
−0.06+0.37
−0.37
BH
46+53
−13
BH
28+13
−13
BH
72+55
−17
0.66+0.15
−0.20
[34]
GW190910_112807
2019-09-10
11:28:07
2020-10-27
11000
14.1+0.2
−0.3
1460+1030
−580
34.3+4.1
−4.1
0.02+0.18
−0.18
BH
43.9+7.6
−6.1
BH
35.6+6.3
−7.2
BH
75.8+8.5
−8.6
0.70+0.08
−0.07
[34]
GW190915_235702
2019-09-15
23:57:02
2020-10-27
13.6+0.2
−0.3
1620+710
−610
25.3+3.2
−2.7
0.02+0.20
−0.25
BH
35.3+9.5
−6.4
BH
24.4+5.6
−6.1
BH
57.2+7.1
−6.0
0.70+0.09
−0.11
Originally designated S230915ak. [34]
GW190916_200658
2019-09-16
20:06:58
2022-05-11
2400
8.1+0.3
−0.5
4900+3700
−2400
26.9+8.2
−5.4
0.20+0.33
−0.31
BH
44+20
−13
BH
23+13
−11
BH
65+17
−13
0.74+0.13
−0.24
[33]
GW190917_114630
2019-09-17
11:46:30
2022-05-11
1700
8.3+0.5
−0.8
720+300
−310
3.7±0.2
−0.08+0.21
−0.43
BH
9.7+3.4
−3.9
MG?
2.1+1.1
−0.4
BH
11.6+3.1
−2.9
0.42+0.14
−0.05
[33]
GW190924_021846
2019-09-24
02:18:46
2020-10-27
360; towards Hydra or Cancer
11.5+0.3
−0.4
570+220
−220
5.8+0.2
−0.2
0.03+0.30
−0.09
BH
8.9+7.0
−2.0
BH?
5.0+1.4
−1.9
BH
13.3+5.2
−1.0
0.67+0.05
−0.05
The secondary component, being between 3.1 and 6.4 solar masses, is either a black hole or an object in the mass gap. Originally designated S230924h. [34]
GW190925_232845
2019-09-25
23:28:45
2022-05-11
2900
9.7+0.3
−0.6
930+460
−350
15.6±1.1
0.09+0.16
−0.15
BH
20.8+6.5
−2.9
BH
15.5+2.5
−3.6
BH
34.9+3.5
−2.6
0.71±0.06
[33]
GW190926_050336
2019-09-26
05:03:36
2022-05-11
2000
8.1+0.6
−0.8
3300+3400
−1700
24.4+9.0
−4.9
−0.02+0.25
−0.32
BH
41+21
−13
BH
20.4+11.4
−8.2
BH
60+22
−12
0.64+0.14
−0.20
[33]
GW190929_012149
2019-09-29
01:21:49
2020-10-27
2200
10.1+0.6
−0.8
2100+3700
−1100
35.8+14.9
−8.2
0.01+0.34
−0.33
BH
81+33
−33
BH
24+19
−11
BH
102+34
−25
0.66+0.20
−0.31
[34]
GW190930_133541
2019-09-30
13:35:41
2020-10-27
1700
9.5+0.3
−0.5
760+360
−320
8.5+0.5
−0.5
0.14+0.31
−0.15
BH
12.3+12.4
−2.3
BH?
7.8+1.7
−3.3
BH
19.4+9.2
−1.5
0.72+0.07
−0.06
The secondary component, being between 4.5 and 9.5 solar masses, is either a black hole or an object in the mass gap. Originally designated S190930s. [34]
GW191103
2019-11-03 01:25:49
2021-11-17
2500
8.9+0.3
−0.5
990+500
−470
8.34+0.66
−0.57
0.21+0.16
−0.10
BH
11.8+6.2
−2.2
BH
7.9+1.7
−2.4
BH
19.0+3.8
−1.7
0.75+0.06
−0.05
[5]
GW191105
2019-11-05 14:35:21
2021-11-17
640
9.7+0.3
−0.5
1150+430
−480
7.82+0.61
−0.45
−0.02+0.13
−0.09
BH
10.7+3.7
−1.6
BH
7.7+1.4
−1.9
BH
17.6+2.1
−1.2
0.67+0.04
−0.05
Originally designated S191105e. [5]
GW191109
2019-11-09 01:07:17
2021-11-17
1600
17.3+0.5
−0.5
1290+1130
−650
47.5+9.6
−7.5
−0.29+0.42
−0.31
BH
65+11
−11
BH
47+15
−13
BH
107+18
−15
0.61+0.18
−0.19
Originally designated S191109d. [5]
GW191113
2019-11-13 07:17:53
2021-11-17
3600
7.9+0.5
−1.1
1290+1130
−650
10.7+1.1
−1.0
0.00+0.37
−0.29
BH
29+12
−14
BH
5.9+4.4
−1.3
BH
34+11
−10
0.45+0.33
−0.11
[5]
GW191126
2019-11-26 11:52:59
2021-11-17
1400
8.3+0.2
−0.5
1620+740
−740
8.65+0.95
−0.71
0.21+0.15
−0.11
BH
12.1+5.5
−2.2
BH
8.3+1.9
−2.4
BH
19.6+3.5
−2.0
0.75+0.06
−0.05
[5]
GW191127
2019-11-27 05:02:27
2021-11-17
980
9.2+0.7
−0.6
3400+3100
−1900
29.9+11.7
−9.1
0.18+0.34
−0.36
BH
53+47
−20
BH
24+17
−14
BH
76+31
−29
0.75+0.13
−0.29
[5]
GW191129
2019-11-29 13:40:29
2021-11-17
850
13.1+0.2
−0.3
790+260
−330
7.31+0.43
−0.28
0.06+0.18
−0.06
BH
10.7+4.1
−2.1
BH
6.7+1.5
−1.7
BH
16.8+2.5
−1.2
0.69+0.03
−0.05
Originally designated S191129u. [5]
GW191204_110529
2019-12-04 11:05:29
2021-11-17
3700
8.8+0.4
−0.6
1800+1700
−1100
19.8+3.6
−3.3
0.05+0.26
−0.27
BH
27.3+11.0
−6.0
BH
19.3+5.6
−6.0
BH
45.0+8.6
−7.6
0.71+0.12
−0.11
[5]
GW191204_171526
2019-12-04 17:15:26
2021-11-17
350; towards Pictor, Caelum, or Eridanus
17.5+0.2
−0.2
650+190
−250
8.55+0.38
−0.27
0.16+0.08
−0.05
BH
11.9+3.3
−1.8
BH
8.2+1.4
−1.6
BH
19.21+1.79
−0.95
0.73+0.03
−0.03
Originally designated S191204r. [5]
GW191215
2019-12-15 22:30:52
2021-11-17
530
11.2+0.3
−0.4
1930+890
−860
18.4+2.2
−1.7
−0.04+0.17
−0.21
BH
24.9+7.1
−4.1
BH
18.1+3.8
−4.1
BH
41.4+5.1
−4.1
0.68+0.07
−0.07
Originally designated S191215w. [5]
GW191216
2019-12-16 21:33:38
2021-11-17
490
18.6+0.2
−0.2
340+120
−130
8.33+0.22
−0.19
0.11+0.13
−0.06
BH
12.1+4.6
−2.3
BH
7.7+1.6
−1.9
BH
18.87+2.80
−0.94
0.70+0.03
−0.04
Originally designated S191216ap. [5]
GW191219
2019-12-19 16:31:20
2021-11-17
1500
9.1+0.5
−0.8
550+250
−160
4.32+0.12
−0.17
0.00+0.07
−0.09
BH
31.1+2.2
−2.8
NS
1.17+0.07
−0.06
BH
32.2+2.2
−2.7
0.14+0.06
−0.06
The event is unconfirmed due to difficulty accurately modelling the extreme mass ratio. [5]
GW191222
2019-12-22 03:35:37
2021-11-17
2000
12.5+0.2
−0.3
3000+1700
−1700
33.8+7.1
−5.0
−0.04+0.20
−0.25
BH
45.1+10.9
−8.0
BH
34.7+9.3
−10.5
BH
75.5+15.3
−9.9
0.67+0.08
−0.11
Originally designated S191222n. [5]
GW191230
2019-12-30 18:04:58
2021-11-17
1100
10.4+0.3
−0.4
4300+2100
−1900
36.5+8.2
−5.6
−0.05+0.26
−0.31
BH
49.4+14.0
−9.6
BH
37+11
−12
BH
82+17
−11
0.68+0.11
−0.13
[5]
GW200105
2020-01-05 16:24:26
2021-06-29
7200
13.7+0.2
−0.4
280±110
3.41+0.08
−0.07
−0.01+0.11
−0.15
BH
8.9+1.2
−1.5
NS
1.9+0.3
−0.2
BH
10.4+2.7
−2.0
0.43+0.04
−0.03
First event confirmed to be a black hole and neutron star merger. Originally designated S200105ae. [53] [54]
GW200112
2020-01-12 15:58:38
2021-11-17
4300
19.8+0.1
−0.2
1250+430
−460
27.4+2.6
−2.1
0.06+0.15
−0.15
BH
35.6+6.7
−4.5
BH
28.3+4.4
−5.9
BH
60.8+5.3
−4.3
0.71+0.06
−0.06
Originally designated S200112r. [5]
GW200114
2020-01-14 02:08:08
2022-08-18
403; towards Gemini, Orion, or Eridanus
1250+1500
−400
68+6
−4
−0.75+0.50
−0.15
BH
78+10
−10
BH
70+10
−10
BH
140+15
−15
Originally designated S200114f. The event was initially published as an unmodeled gravitational wave burst, and different studies have offered conflicting interpretations. One study suggested it was a nearby high-mass black hole merger with component masses of 118+10
−12
and 89+18
−8
Msun which was poorly modeled because of its high mass. [55] Another study interpreted it as a somewhat smaller black hole merger taking place at the same time as a detector glitch. [56] Both studies conclude the signal is most likely a real event, and the latter model is included in the table.
[55] [56]
GW200115
2020-01-15 04:23:09
2021-06-29
600
11.3+0.3
−0.5
300+150
−100
2.42+0.05
−0.07
−0.19+0.23
−0.35
BH
5.7+1.8
−2.1
NS
1.5+0.7
−0.3
BH
7.8+1.4
−1.6
0.38+0.04
−0.03
Second event confirmed to be a black hole and neutron star merger. Originally designated S200115j. [53] [57]
GW200128
2020-01-28 02:20:11
2021-11-17
2600
10.6+0.3
−0.4
3400+2100
−1800
32.0+7.5
−5.5
0.12+0.24
−0.25
BH
42.2+11.6
−8.1
BH
32.6+9.5
−9.2
BH
71+16
−11
0.74+0.10
−0.10
Originally designated S200128d. [5]
GW200129
2020-01-29 06:54:58
2021-11-17
130; towards Equuleus, Delphinus, or Vulpecula
26.8+0.2
−0.2
900+290
−380
27.2+2.1
−2.3
0.11+0.11
−0.16
BH
34.5+9.9
−3.2
BH
28.9+3.4
−9.3
BH
60.3+4.0
−3.3
0.73+0.06
−0.05
Originally designated S200129m. [5]
GW200202
2020-02-02 15:43:12
2021-11-17
170
10.8+0.2
−0.4
410+150
−160
7.49+0.24
−0.20
0.04+0.13
−0.06
BH
10.1+3.5
−1.4
BH
7.3+1.1
−1.7
BH
16.76+1.87
−0.66
0.69+0.03
−0.04
[5]
GW200208_130117
2020-02-08 13:01:17
2021-11-17
30; towards Pyxis or Antlia
10.8+0.3
−0.4
2230+1000
−850
27.7+3.6
−3.1
−0.07+0.22
−0.27
BH
37.8+9.2
−8.2
BH
27.5+6.1
−7.4
BH
62.5+7.3
−6.4
0.66+0.09
−0.13
Originally designated S200208q. [5]
GW200208_222617
2020-02-08 22:26:17
2021-11-17
2000
7.4+1.4
−1.2
4100+4400
−1900
19.6+10.7
−5.1
0.45+0.43
−0.44
BH
51+104
−30
BH
12.3+9.0
−5.7
BH
61+100
−25
0.83+0.14
−0.27
[5]
GW200209
2020-02-09 08:54:52
2021-11-17
730
9.6+0.4
−0.5
3400+1900
−1800
26.7+6.0
−4.2
−0.12+0.24
−0.30
BH
35.6+10.5
−6.8
BH
27.1+7.8
−7.8
BH
59.9+13.1
−8.9
0.66+0.10
−0.12
[5]
GW200210
2020-02-10 09:22:54
2021-11-17
1800
8.4+0.5
−0.7
940+430
−340
6.56+0.38
−0.40
0.02+0.22
−0.21
BH
24.1+7.5
−4.6
MG
2.83+0.47
−0.42
BH
26.7+7.2
−4.3
0.34+0.13
−0.08
The secondary component, being between 2.41 and 3.30 solar masses, is an object in the mass gap. [5]
GW200216
2020-02-16 22:08:04
2021-11-17
2900
8.1+0.4
−0.5
3800+3000
−2000
32.9+9.3
−8.5
0.10+0.34
−0.36
BH
51+22
−13
BH
30+14
−16
BH
78+19
−13
0.70+0.14
−0.24
[5]
GW200219
2020-02-19 09:44:15
2021-11-17
700
10.7+0.3
−0.5
3400+1700
−1500
27.6+5.6
−3.8
−0.08+0.23
−0.29
BH
37.5+10.1
−6.9
BH
27.9+7.4
−8.4
BH
62.2+11.7
−7.8
0.66+0.10
−0.13
Originally designated S200219ac. [5]
GW200220_061928
2020-02-20 06:19:28
2021-11-17
3000
7.2+0.4
−0.7
6000+4800
−3100
62+23
−15
0.06+0.40
−0.38
BH
87+40
−23
BH
61+26
−25
BH
141+51
−31
0.71+0.15
−0.17
[5]
GW200220_124850
2020-02-20 12:48:50
2021-11-17
3200
8.5+0.3
−0.5
4000+2800
−2200
28.2+7.3
−5.1
−0.07+0.27
−0.33
BH
38.9+14.1
−8.6
BH
27.9+9.2
−9.0
BH
64+16
−11
0.67+0.11
−0.14
[5]
GW200224
2020-02-24 22:22:34
2021-11-17
50; towards Virgo or Crater
20.0+0.2
−0.2
1710+490
−640
31.1+3.2
−2.6
0.10+0.15
−0.15
BH
40.0+6.9
−4.5
BH
32.5+5.0
−7.2
BH
68.6+6.6
−4.7
0.73+0.07
−0.07
Originally designated S200224ca. [5]
GW200225
2020-02-25 06:04:21
2021-11-17
370; towards Ursa Minor or Cepheus
12.5+0.3
−0.4
1150+510
−530
14.2+1.5
−1.4
−0.12+0.17
−0.28
BH
19.3+5.0
−3.0
BH
14.0+2.8
−3.5
BH
32.1+3.5
−2.8
0.66+0.07
−0.13
Originally designated S200225q. [5]
GW200302
2020-03-02 01:58:11
2021-11-17
6000
10.8+0.3
−0.4
1480+1020
−700
23.4+4.7
−3.0
0.01+0.25
−0.26
BH
37.8+8.7
−8.5
BH
20.0+8.1
−5.7
BH
55.5+8.9
−8.6
0.66+0.13
−0.15
Originally designated S200302c. [5]
GW200306
2020-03-06 09:37:14
2021-11-17
4600
7.8+0.4
−0.6
2100+1700
−1100
17.5+3.5
−3.0
0.32+0.28
−0.46
BH
28.3+17.1
−7.7
BH
14.8+6.5
−6.4
BH
41.7+12.3
−6.9
0.78+0.11
−0.26
[5]
GW200308
2020-03-08 17:36:09
2021-11-17
2000
7.1+0.5
−0.5
5400+2700
−2600
19.0+4.8
−2.8
0.65+0.21
−0.17
BH
36.4+11.2
−9.6
BH
13.8+7.2
−3.3
BH
47.4+11.1
−7.7
0.91+0.03
−0.08
[5]
GW200311
2020-03-11 11:58:53
2021-11-17
35; towards Cetus
17.8+0.2
−0.2
1170+280
−400
26.6+2.4
−2.0
−0.02+0.16
−0.20
BH
34.2+6.4
−3.8
BH
27.7+4.1
−5.9
BH
59.0+4.8
−3.9
0.69+0.07
−0.08
Originally designated S200311bg. [5]
GW200316
2020-03-16 21:57:56
2021-11-17
190
10.3+0.4
−0.7
1120+470
−440
8.75+0.62
−0.55
0.13+0.27
−0.10
BH
13.1+10.2
−2.9
BH
7.8+1.9
−2.9
BH
20.2+7.4
−1.9
0.70+0.04
−0.04
Originally designated S200316bj. [5]
GW200322
2020-03-22 09:11:33
2021-11-17
6500
6.0+1.7
−1.2
3600+7000
−2000
15.5+15.7
−3.7
0.24+0.45
−0.51
BH
34+48
−18
BH
14.0+16.8
−8.7
BH
53+38
−26
0.78+0.16
−0.17
[5]
GW230529

2023-05-29 18:15:00

2024-04-05
25600
11.4+0.2
−0.1
201+102
−96
1.94+0.04
−0.04
−0.1+0.12
−0.17
MG
3.6+0.8
−1.2
NS
1.4+0.6
−0.2
?
Originally designated S230529ay. Was detected using only the LIGO Livingston detector. It provides strong support for the primary object to be within the mass gap. [58]
GW231123

2023-11-23 13:54:30

2025-07-10
22.6+0.2
−0.3
2200+1900
−1500
BH
137+22
−17
BH
103+20
−52
BH
225+26
−43
Originally designated S231123cg. The most massive black hole merger detected as of July 2025 [59]
Gravitational Wave Transient Catalog 1. Credit:LIGO Scientific Collaboration and Virgo Collaboration/Georgia Tech/S. Ghonge & K. Jani Gravitational Wave Transient Catalog 1.png
Gravitational Wave Transient Catalog 1. Credit:LIGO Scientific Collaboration and Virgo Collaboration/Georgia Tech/S. Ghonge & K. Jani

Candidate events and marginal detections

There is possible detection of nanohertz waves by observation of the timing of pulsars, but they have not been confirmed at the 5 sigma level of confidence, as of 2023. [60]

Marginal detections from O1 and O2

In addition to well-constrained detections listed above, a number of low-significance detections of possible signals were made by LIGO and Virgo. Their characteristics are listed below, only including detections with a <50% chance of being noise:

Marginal event detections
Candidate
event
Detection
time (UTC)
Date
published
Luminosity
distance

(Mpc) [n 12]
Detector
[n 13]
False alarm
rate (year)
Effective spinPrimarySecondaryProbability of terrestrial noiseNotesRef
TypeMass (M)TypeMass (M)
1512052015-12-05 19:55:252019-10-113000+2400
−1600
H,L0.610.14+0.40
−0.38
BH
67+28
−17
BH
42+16
−19
0.47 [61]
1701212017-01-21 21:25:362019-04-15H,L−0.3±0.3
BH
29+4
−3
BH
<0.01 [62]
1703042017-03-04 16:37:532019-10-112300+1600
−1200
H,L2.50.11+0.29
−0.27
BH
44.9+17.6
−9.4
BH
31.8+9.5
−11.6
0.30 [61]
1704022017-04-02 21:51:502019-10-21H,L0.32 [63]
1707272017-07-27 01:04:302019-10-112200+1500
−1100
H,L180−0.05+0.25
−0.30
BH
41.6+12.8
−7.9
BH
30.4+7.9
−8.2
0.006 [61]
170817A2017-08-17 03:02:462019-10-21H,L,V11.50.5±0.2
BH
56+16
−10
BH
40+10
−11
0.14 [63]

Observation candidates from O3/2019

From observation run O3/2019 on, observations are published as Open Public Alerts to facilitate multi-messenger observations of events. [64] [65] [66] Candidate event records can be directly accessed at the Gravitational-Wave Candidate Event Database (GraceDB). [67] On 1 April 2019, the start of the third observation run was announced with a circular published in the public alerts tracker. [68] The first O3/2019 binary black hole detection alert was broadcast on 8 April 2019. A significant percentage of O3 candidate events detected by LIGO are accompanied by corresponding triggers at Virgo.

False alarm rates are mixed, with more than half of events assigned false alarm rates greater than 1 per 20 years, contingent on presence of glitches around signal, foreground electromagnetic instability, seismic activity, and operational status of any one of the three LIGO-Virgo instruments. For instance, events S190421ar and S190425z weren't detected by Virgo and LIGO's Hanford site, respectively.

The LIGO/Virgo collaboration took a short break from observing during the month of October 2019 to improve performance and prepare for future plans, with no signals detected in that month as a result. [69]

The Kamioka Gravitational Wave Detector (KAGRA) in Japan became operational on 25 February 2020, [70] likely improving the detection and localization of future gravitational wave signals. [71] However, KAGRA does not report their signals in real-time on GraceDB as LIGO and Virgo do, so the results of their observation run will likely not be published until the end of O3.

The LIGO-Virgo collaboration ended the O3 run early on March 27, 2020, due to health concerns from the COVID-19 pandemic. [72] [73]

Candidate detections from O3 by month
1
2
3
4
5
6
7
8
9
10
19/04
19/05
19/06
19/07
19/08
19/09
19/10
19/11
19/12
20/01
20/02
20/03
  •   BNS mergers
  •   NS-BH mergers
  •   mass gap
  •   BBH mergers
  •   terrestrial noise
  •   false positives
  •   unidentified
O3 detections by distance
2
4
6
8
10
12
14
16
18
20
<100 Mpc
100-200 Mpc
200-500 Mpc
500-1000 Mpc
1-2 Gpc
2-5 Gpc
5+ Gpc
  •   BNS mergers
  •   NS-BH mergers
  •   mass gap
  •   BBH mergers
List of unconfirmed O3 event alerts [12] [13]
GW eventDetection
time (UTC)
Location
area [n 14]
(deg2)
Luminosity
distance

(Mpc) [n 15]
Detector
[n 16]
False alarm
Rate (Hz)
False alarm
chance in O3 [n 17]
Classification NotesRef
NS / NS
[n 18]
NS / BH
[n 19]
BH / BH
[n 20]
Mass gap
[n 21]
Terrestrial
[n 22]
S190901ap2019-09-01
23:31:01
14753
241±79
L,V7.0 10−90.1810.8610.00.00.00.139 [74]
S190910d2019-09-10
01:26:19
2482
632±186
H,L3.7 10−90.1000.00.9760.00.00.024 [75]
S190910h2019-09-10
08:29:58
24264
230±88
L3.6 10−80.6420.6120.00.00.00.388Detected by only the Livingston detector, resulting in a bad sky localization. [76]
S190923y2019-09-23 12:55:59
2107
438±133
H,L4.8 10−80.7460.00.6770.00.00.322 [77]
S190930t2019-09-30 14:34:07
24220
108±38
L1.5 10−80.3480.00.7430.00.00.257Detected by only the Livingston detector, resulting in a bad sky localization; last detection of the O3a run. [78]
S191205ah2019-12-05 21:52:08
6378
385±164
H,L,V1.2 10−80.2900.00.9320.00.00.068 [79]
S191213g2019-12-13 04:34:08
4480
201±81
H,L,V3.5 10−80.6310.7680.00.00.00.232 [80]
S200213t2020-02-13 04:10:40
2326
201±80
H,L,V1.8 10−80.4010.6290.00.00.00.371 [81]

Observation candidates from O4/2023

On 15 June 2022, LIGO announced to start the O4 observing run in March 2023. [82] As the date got closer, engineering challenges delayed the observing run to May 2023. [83] An engineering run to assess the sensitivity of LIGO, Virgo, and KAGRA began in April, with the Hanford detector's first operations beginning on April 29, [84] and the Livingston and Virgo detectors' first operations beginning on May 5. [85]

On March 7, 2023, a gamma-ray burst compatible with a neutron star merger was detected by the Fermi telescope and named GRB 230307A. The burst, identified as being from a host galaxy approximately 296 Mpc away, would likely have only been marginally detected at best by LIGO if it had been operating at the time, as the detectors would only later achieve a sensitivity of 160 Mpc for neutron star mergers by O4's beginning, 3 months later.

Near the end of the engineering run on 15 May 2023, LIGO announced that O4 would be beginning on 24 May 2023, running for 20 months with up to 2 months of maintenance. The LIGO detectors initially failed to achieve the hoped for 160-190 Mpc sensitivity for neutron star mergers, but did achieve an improved 130-150 Mpc sensitivity over O3's 100-140 Mpc, later improving to nearly 160 Mpc for both detectors by late 2023. Virgo was found to have both a damaged mirror and other new, unknown noise sources, limiting its sensitivity to just 31-35 Mpc (similar to its performance during O2 in 2017, and lower than O3's 40-50 Mpc.) As a result, Virgo spent most of 2023 in commissioning, with a deadline of March 2024 to improve its sensitivity before joining O4. KAGRA achieved its planned 1 Mpc sensitivity before returning to commissioning in July, with plans to rejoin at an improved 10 Mpc sensitivity by early 2024. However, the Mw 7.5 2024 Noto earthquake occurred on 1 January 2024 only 103 kilometres (64 mi) from KAGRA, damaging the detector's sensitive instruments and delaying its development by at least several months.

On 18 May 2023, near the end of the engineering run and shortly before O4 proper, the first candidate gravitational wave event was detected. Four more were detected before the official beginning of the run. In October, LIGO announced a planned pause between January and March 2024, for a mid-run commissioning break intended to reduce noise and improve the uptime of the detectors.

The O4b run began in April 2024 with the addition of the Virgo detector at a sensitivity of 55 Mpc. The Livingston detector achieved an increased sensitivity of 170-175 Mpc, while the Hanford detector maintained its pre-break sensitivity of 155-160 Mpc. Due to a variety of factors including delays in technologies required for O5, the decision was made in June 2024 to extend O4 by several months to June 2025, with O5 expected to begin in late 2027 or early 2028.

Candidate detections from O4 by month [n 23]
5
10
15
20
25
30
2305
06
07
08
09
10
11
12
2401
02
03
04
05
06
07
08
09
10
11
12
2501
02
03
04
05
06
07
08
  •   BNS mergers
  •   NS-BH mergers
  •   mass gap
  •   BBH mergers
  •   unidentified
O4 detections by distance [n 23]
15
30
45
60
75
90
105
120
135
150
<100 Mpc
100-200 Mpc
200-500 Mpc
500-1000 Mpc
1-2 Gpc
2-5 Gpc
5-10 Gpc
10+ Gpc
  •   BNS mergers
  •   NS-BH mergers
  •   mass gap
  •   BBH mergers
List of O4 event alerts
GW event Detection
time (UTC)
Location
area
[n 24]
(deg2)
Luminosity
distance

(Mpc)
[n 25]
Detector
[n 26]
False Alarm
Rate (Hz)
False Alarm
chance in O4
[n 27]
[n 23]
Classification NotesRef
NS / NS
[n 28]
NS / BH
[n 29]
BH / BH
[n 30]
Mass gap
[n 31]
Terrestrial
[n 32]
S230518h2023-05-18
12:59:07
460; near the galactic plane
204±57
H,L3.2 10−100.0180.00.8640.0370.00.099 Detected during the engineering phase, before the official start of O4. [86]
S230520ae2023-05-20
22:48:41
1702
2014±663
H,L3.1 10−90.1610.00.0~1.00.01.4e−7 [87]
S230522a2023-05-22
09:38:04
24219
3102±1032
L1.0 10−80.4480.00.00.999730.000710.00027 [88]
S230522n2023-05-22
15:30:32
29021
2221±870
L6.5 10−90.3110.00.00.9930.00410.0069 [89]
S230601bf2023-06-01
22:41:34
2531
3565±1260
H,L1.7 10−159.6 10−80.00.0~1.00.00226.4e−9 [90]
S230605o2023-06-05
06:53:43
1077
1067±333
H,L4.5 10−90.2290.00.00.9880.00.012 [91]
S230606d2023-06-06
00:43:05
1221
2545±874
H,L1.1 10−80.4810.00.00.999280.00.00072 [92]
S230608as2023-06-08
20:50:47
1694
3447±1079
H,L1.4 10−100.00780.00.00.999810.00.00019 [93]
S230609u2023-06-09
06:49:58
1287
3390±1125
H,L1.0 10−80.4380.00.00.9610.00.038 [94]
S230624av2023-06-24
11:31:03
1024
2124±682
H,L1.3 10−80.5260.00.00.9530.00.047 [95]
S230627c2023-06-27
01:53:37
82; towards Leo, Leo Minor, Ursa Major, or Draco
291±64
H,L3.2 10−100.0180.00.3650.3540.2510.030 [96]
S230628ax2023-06-28
23:12:00
705
2047±585
H,L3.2 10−100.0180.00.0~1.00.02.4e−5 [97]
S230630am2023-06-30
12:58:06
3642
8710±2735
H,L2.4 10−80.7500.00.00.9410.0420.017 [98]
S230630bq2023-06-30
23:45:32
1975
1150±360
H,L7.7 10−90.3580.00.000760.8900.0790.031 [99]
S230702an2023-07-02
18:54:53
2267
2428±849
H,L1.5 10−128.8 10−50.00.0~1.00.02.8e−5 [100]
S230704f2023-07-04
02:12:11
1948
2965±978
H,L2.8 10−90.1490.00.00.9970.00.0026 [101]
S230706ah2023-07-06
10:43:33
1553
2143±684
H,L4.3 10−80.9140.00.00.9390.0350.027 [102]
S230707ai2023-07-07
12:40:47
2714
3766±1135
H,L1.4 10−80.5460.00.00.9510.00.049 [103]
S230708t2023-07-08
05:37:05
1227
3010±988
H,L4.3 10−80.9170.00.00.9730.00410.027 [104]
S230708z2023-07-08
07:18:59
3373
4647±1696
H,L7.0 10−80.9820.00.00.9540.00410.046 [105]
S230708cf2023-07-08
23:09:35
2525
2056±608
H,L1.6 10−80.5900.00.00.9890.00.011 [106]
S230709bi2023-07-09
12:27:27
2644
4364±1585
H,L3.1 10−90.1610.00.00.9970.00.0028 [107]
S230723ac2023-07-23
10:18:23
1117
1551±436
H,L5.3 10−80.9530.00.00.8670.00.133 [108]
S230726a2023-07-26
00:29:40
27774
2132±714
L3.8 10−142.2 10−60.00.0~1.00.01.4e−7 Detected by only the Livingston detector, resulting in a bad sky localization. [109]
S230729z2023-07-29
08:23:17
1945
1495±444
H,L3.4 10−90.1770.00.00.9420.0550.0030 [110]
S230731an2023-07-31
21:53:07
599
1001±242
H,L3.2 10−100.0180.00.1740.7710.0530.0022 [111]
S230802aq2023-08-02
11:33:59
25885
576±246
H2.2 10−80.7220.00.0200.2890.6570.035 The other component is a black hole. Detected by only the Hanford detector, resulting in a bad sky localization. [112]
S230805x2023-08-05
03:42:49
2235
3852±1193
H,L9.2 10−90.4100.00.00.999750.00.00025 [113]
S230806ak2023-08-06
20:40:41
3715
5423±1862
H,L3.0 10−90.1560.00.00.9970.00.0026 [114]
S230807f2023-08-07
20:50:45
5436
5272±1900
H,L7.1 10−80.9830.00.00.9130.0410.047 [115]
S230811n2023-08-11
03:21:16
810
1905±672
H,L3.2 10−100.0180.00.0~1.00.02.2e−5 [116]
S230814r2023-08-14
06:19:20
3389
3788±1416
H,L4.8 10−80.9370.00.00.9320.00.068 [117]
S230814ah2023-08-14
23:09:01
25259
330±105
L1.7 10−210.00.00.0~1.00.02.0e−14 Detected by only the Livingston detector, resulting in a bad sky localization. [118]
S230819ax2023-08-19
17:19:10
4044
4216±1645
H,L8.8 10−90.3980.00.00.9930.00.0072 [119]
S230820bq2023-08-20
21:25:15
1373
3600±1437
H,L4.2 10−80.9120.00.00.9580.00.042 [120]
S230822bm2023-08-22
23:03:37
3974
5154±1771
H,L2.6 10−80.7730.00.00.9390.0420.019 [121]
S230824r2023-08-24
03:30:47
3279
4701±1563
H,L1.6 10−110.000940.00.0~1.00.02.9e−5 [122]
S230825k2023-08-25
04:13:34
3012
5283±2117
H,L2.4 10−90.1280.00.00.9390.0590.0022 [123]
S230831e2023-08-31
01:54:14
3803
4900±2126
H,L2.0 10−80.6790.00.00.9850.00730.015 [124]
S230904n2023-09-04
05:10:13
2015
1095±327
H,L2.2 10−90.1210.00.00070.9270.0640.009 [125]
S230911ae2023-09-11
19:53:24
27759
1623±584
H1.9 10−120.000110.00.0~1.00.03.6e−6 Detected by only the Hanford detector, resulting in a bad sky localization. [126]
S230914ak2023-09-14
11:14:01
1532
2676±827
H,L9.0 10−100.0500.00.00.9920.00.0083 [127]
S230919bj2023-09-19
21:57:12
708
1491±402
H,L3.2 10−100.0180.00.00.999650.00.00035 [128]
S230920al2023-09-20
07:11:24
2180
3139±1003
H,L3.2 10−100.0180.00.0~1.00.01.1e−5 [129]
S230922g2023-09-22
02:03:44
324; towards Pisces Austrinus or Aquarius
1491±443
H,L1.9 10−240.00.00.0~1.00.00.0 [130]
S230922q2023-09-22
04:06:58
4658
6653±2348
H,L3.6 10−100.0210.00.0~1.00.02.2e−5 [131]
S230924an2023-09-24
12:44:53
835
2358±596
H,L3.2 10−100.0180.00.0~1.00.01.9e−5 [132]
S230927l2023-09-27
04:37:29
1177
2966±1041
H,L1.1 10−80.4610.00.00.9760.00.024 [133]
S230927be2023-09-27
15:38:32
298
1059±289
H,L3.2 10−100.0180.00.00.999660.00.00034 [134]
S230928cb2023-09-28
21:58:27
3102
4060±1553
H,L9.5 10−100.0530.00.0~1.00.02.8e−5 [135]
S230930al2023-09-30
11:07:30
3166
4902±1671
H,L7.4 10−90.3460.00.00.9940.00410.0061 [136]
S231001aq2023-10-01
14:02:20
3181
4425±1946
H,L5.0 10−90.2480.00.00.9960.00440.0040 [137]
S231005j2023-10-05
02:10:30
5480
6417±2246
H,L3.2 10−80.8420.00.00.9780.00.022 [138]
S231005ah2023-10-05
09:15:49
2497
3707±1335
H,L2.0 10−90.1110.00.00.9980.00410.0015 [139]
S231008ap2023-10-08
14:25:21
3102
3531±1320
H,L1.5 10−90.0840.00.00.99860.00.0014 [140]
S231014r2023-10-14
04:05:48
1807
2857±903
H,L1.0 10−80.4480.00.00.9920.00.0080 [141]
S231020ba2023-10-20
14:29:47
1339
1168±361
H,L1.3 10−90.0700.00.0760.8510.0660.0070 [142]
S231020bw2023-10-20
18:05:09
386
2620±694
H,L3.5 10−100.0200.00.00.999650.00.00035 [143]
S231028bg2023-10-28
15:30:06
1207
4221±923
H,L7.6 10−310.00.00.0~1.00.00.0 [144]
S231029y2023-10-29
11:15:08
29972
3292±1313
L2.2 10−100.0120.00.00.999770.00.00023 Detected by only the Livingston detector, resulting in a bad sky localization. [145]
S231102w2023-11-02
07:17:36
2343
3493±1015
H,L5.8 10−230.00.00.0~1.00.03.3e−16 [146]
S231104ac2023-11-04
13:34:18
759
1357±321
H,L3.2 10−100.0180.00.00200.9880.00880.0018 [147]
S231108u2023-11-08
12:51:42
949
1986±494
H,L3.2 10−100.0180.00.00.999690.00.00032 [148]
S231110g2023-11-10
04:03:20
636
1849±533
H,L1.9 10−80.6700.00.00.9680.00.032 [149]
S231113bb2023-11-13
12:26:23
2172
3260±1181
H,L5.6 10−80.9600.00.00.9650.00410.035 [150]
S231113bw2023-11-13
20:04:17
1713
1186±376
H,L1.4 10−80.5430.00.1610.7430.0560.040 [151]
S231114n2023-11-14
04:32:11
1267
1317±407
H,L3.2 10−100.0180.00.00.999850.00950.00015 [152]
S231118d2023-11-18
00:56:26
956
2110±585
H,L3.2 10−100.0180.00.00.999810.00.00019 [153]
S231118ab2023-11-18
07:14:02
2898
4353±1588
H,L1.9 10−80.6630.00.00.9850.00.015 [154]
S231118an2023-11-18
09:06:02
1107
1337±347
H,L7.5 10−80.9860.00.0150.7260.0170.242 [155]
S231119u2023-11-19
07:52:48
5211
6597±2556
H,L7.4 10−80.9860.00.0150.9140.0410.045 [156]
S231127cg2023-11-27
16:53:00
3450
4425±1718
H,L5.8 10−90.2840.00.00.9960.00630.0044 [157]
S231129ac2023-11-29
08:17:45
3089
3964±1513
H,L1.8 10−80.6370.00.00.9860.00410.014 [158]
S231206ca2023-12-06
23:31:34
2335
3230±1141
H,L3.2 10−100.0180.00.00.999980.00.000018 [159]
S231206cc2023-12-06
23:39:01
342
1467±264
H,L1.9 10−350.00.00.0~1.00.00.0 [160]
S231213ap2023-12-13
11:14:17
1469
3861±1257
H,L6.3 10−100.0360.00.00.999980.00.000022 [161]
S231223j2023-12-23
03:28:36
3520
4468±1602
H,L1.1 10−90.0620.00.00.999050.0000230.00095 [162]
S231224e2023-12-24
02:43:21
394
863±213
H,L1.5 10−90.0840.00.000190.8800.1170.0034 [163]
S231226av2023-12-26
10:15:20
199
1218±171
H,L1.1 10−500.00.00.0~1.00.00.0 [164]
S231231ag2023-12-31
15:40:16
27061
1066±339
H8.4 10−154.8 10−70.00.0~1.00.02.9e−8 Detected by only the Hanford detector, resulting in a bad sky localization. [165]
S240104bl2024-01-04
16:49:32
27948
1978±618
H3.6 10−170.00.00.0~1.00.02.2e−10 Detected by only the Hanford detector, resulting in a bad sky localization. [166]
S240107b2024-01-07
01:32:15
4143
6089±2429
H,L5.8 10−80.9650.00.00.9660.00.034 [167]
S240109a2024-01-09
05:04:31
28048
1594±567
H7.3 10−90.3440.00.00.9950.00.0053 Detected by only the Hanford detector, resulting in a bad sky localization. [168]
S240406aj2024-04-06
06:28:47
1724
2449±692
H,L1.6 10−158.9 10−80.00.0~1.00.09.2e−9 [169]
S240413p2024-04-13
02:20:19
34; towards Leo or Sextans
526±101
H,L,V3.2 10−100.0180.00.00.5840.4000.020 [170]
S240420ax2024-04-20
04:21:16
6423
?
H,L5.7 10−80.9610.00.00.00.0?Unidentified gravitational wave "burst" lasting 33 milliseconds at a frequency of 219 Hertz. [171]
S240422ed2024-04-22
21:35:13
259; towards Puppis, Pyxis, or Hydra
188±43
H,L,V3.1 10−131.8 10−50.00.5410.00.4591.3e−5 [172]
S240426s2024-04-26
03:14:51
3050
3452±1295
H,L7.6 10−90.3540.00.00.9680.0300.00191 [173]
S240428dr2024-04-28
22:54:40
286
765±177
H,V2.1 10−141.2 10−60.00.0~1.00.07.4e−8 [174]
S240430ca2024-04-30
09:35:17
4061
6212±2593
H,L7.5 10−80.9860.00.00.9200.0410.039 [175]
S240501an2024-05-01
03:35:34
1079
4022±1460
H,L,V4.2 10−100.0240.00.00.999990.01.3e−5 [176]
S240505av2024-05-05
13:35:52
1469
4570±1415
H,L,V2.3 10−80.7310.00.00.9850.00.015 [177]
S240507p2024-05-07
04:16:32
279; mostly towards
Canis Major or Cassiopeia
1328±370
H,L,V6.3 10−100.0360.00.00.9630.0360.00031 [178]
S240511i2024-05-11
03:15:07
85; towards Crater or Hydra
1906±404
H,L,V3.2 10−100.0180.00.00.999980.01.7e−5 [179]
S240512r2024-05-12
02:41:39
216
1082±266
H,L,V3.2 10−100.0180.00.0200.9580.0200.0017 [180]
S240513ei2024-05-13
18:33:02
37; towards Auriga or Perseus
2254±458
H,L,V3.2 10−100.0180.00.00.999730.00.00027 [181]
S240514c2024-05-14
08:03:21
30758
4182±1833
L9.6 10−90.4250.00.00.99320.00.0064 Detected by only the Livingston detector, resulting in a bad sky localization. [182]
S240514x2024-05-14
12:17:13
142; mostly towards Reticulum
2594±587
H,L,V3.2 10−100.0180.00.00.999980.01.8e−5 [183]
S240515m2024-05-15
00:53:01
978
3559±976
H,L,V5.3 10−210.00.00.0~1.00.04.3e−14 [184]
S240520cv2024-05-20
21:36:16
89; towards Ursa Major, Indus, or Tucana
1136±235
H,L,V3.2 10−100.0180.00.0300.9210.0470.0018 [185]
S240525p2024-05-25
03:12:10
1517
4337±1519
H,L,V1.7 10−80.6190.00.00.9020.0860.012 [186]
S240527en2024-05-27
18:34:29
986
5850±1907
H,L,V2.5 10−90.1350.00.000900.999070.02.7e−5 [187]
S240527fv2024-05-27
23:09:10
19; towards Horologium
1119±188
H,L,V1.4 10−80.5590.00.00.9870.00360.0096 [188]
S240530a2024-05-30
01:24:17
196
1066±226
H,L,V9.5 10−100.0530.00.00.9100.0850.0048 [189]
S240531bp2024-05-31
07:52:48
1323
3766±1491
H,L,V3.7 10−120.000220.00.00.999990.06.5e−6 [190]
S240601aj2024-06-01
06:12:00
2009
5366±2095
H,L3.1 10−80.8290.00.00.5070.00.493 [191]
S240601co2024-06-01
23:10:04
1110
1421±390
H,L,V6.0 10−110.00340.00.00.9280.0720.00023 [192]
S240615dg2024-06-15
11:36:20
5; towards northern Andromeda
1420±236
H,L,V3.2 10−100.0180.00.00.999980.01.7e−5 [193]
S240615ea2024-06-15
16:07:35
653
3590±1058
H,L,V1.5 10−80.5820.00.00.999380.00.00062 [194]
S240618ah2024-06-18
07:16:27
5116
5939±2437
H,L6.5 10−80.9760.00.00.9210.0410.038 [195]
S240621dy2024-06-21
19:50:59
21; towards Perseus
1184±199
H,L,V4.0 10−200.00.00.0~1.00.00.0 [196]
S240621eb2024-06-21
20:09:35
920
4492±1407
H,L,V4.3 10−80.9160.00.00.99870.00.0013 [197]
S240621em2024-06-21
21:40:41
3069
7458±2672
H,L,V6.8 10−80.9790.00.00.9200.0410.039 [198]
S240622h2024-06-22
00:40:48
199
1350±303
H,L,V1.2 10−80.4990.00.00.9740.0110.015 [199]
S240627by2024-06-27
13:16:22
934
1479±420
H,L,V1.2 10−80.5000.00.00.9110.0800.0084 [200]
S240629by2024-06-29
14:52:56
66
1173±245
H,L,V3.2 10−100.0180.00.0730.7980.1270.0015 [201]
S240630t2024-06-30
10:17:03
670
3161±841
H,L,V1.9 10−120.000110.00.0~1.00.03.3e−6 [202]
S240703ad2024-07-03
19:13:55
3785
1894±679
H,V1.2 10−136.8 10−60.00.0~1.00.02.8e−7 [203]
S240705at2024-07-05
05:32:15
172
3694±880
H,L,V7.1 10−163.8 10−80.00.0~1.00.00.0 [204]
S240716b2024-07-16
03:49:00
10324
1821±686
L,V7.9 10−164.5 10−80.00.0~1.00.03.6e−9 [205]
S240807h2024-08-07
21:45:59
12857
1018±295
L,V2.0 10−110.00120.00.000100.9560.0443.2e−5 [206]
S240813c2024-08-13
03:45:48
13782
1240±392
L,V2.6 10−90.1390.00.00.9090.0890.0022 [207]
S240813d2024-08-13
04:39:13
1776
1065±259
L,V1.8 10−180.00.00.0~1.00.01.2e−11 [208]
S240825ar2024-08-25
05:51:46
1203
1342±380
H,L,V3.2 10−90.1660.00.0250.9300.0360.0091 [209]
S240830gn2024-08-30
21:11:20
410
1118±297
H,L,V6.3 10−100.0360.00.1050.8910.0840.0031 [210]
S240902bq2024-09-02
14:33:06
584
2420±828
H,L,V2.5 10−90.1350.00.00.999900.09.94e−5 [211]
S240907cg2024-09-07
15:38:33
1065
4333±1354
H,L,V9.1 10−100.0510.00.00.999140.00.00086 [212]
S240908bs2024-09-08
08:26:28
74; towards northern Aries
3350±1130
H,L,V3.2 10−100.0180.00.00.9970.00311.4e−5 [213]
S240908dg2024-09-08
12:51:34
1021
5004±1764
H,L,V7.2 10−80.9840.00.00.9100.0410.050 [214]
S240910ci2024-09-10
10:35:35
394
662±166
H,L3.2 10−100.0180.00.2800.6280.0900.0015 [215]
S240915b2024-09-15
00:13:57
18; towards Southern Puppis
872±149
H,L,V3.2 10−100.0180.00.1210.7450.1320.0015 [216]
S240915bd2024-09-15
10:51:51
4244
612±139
H,V3.3 10−141.9 10−60.00.000370.8990.1011.2e−7 [217]
S240917cb2024-09-17
13:02:37
8644
6657±3466
H,L5.4 10−80.9550.00.00.9030.0570.040 [218]
S240919bn2024-09-19
06:15:59
16; towards Southern Perseus
1711±490
H,L,V4.0 10−200.00.00.0~1.00.00.0 [219]
S240920bz2024-09-20
07:34:24
349
1372±305
H,L,V3.2 10−100.0180.00.00.999720.00.00028 [220]
S240920dw2024-09-20
12:40:24
135
977±160
H,L9.7 10−520.00.00.0~1.00.00.0 [221]
S240921cw2024-09-21
20:18:35
471
866±204
L,V3.2 10−100.0450.00.00.9970.00250.00078 [222]
S240922df2024-09-22
14:21:06
97; towards Capricornus
1175±262
H,L,V1.4 10−240.00.00.00.9650.0350.0 [223]
S240923ct2024-09-23
20:40:06
4025±1076
H,L,V7.6 10−164.5 10−80.00.0~1.00.02.9e−9 [224]
S240924a2024-09-24
00:03:16
660
3816±1285
H,L,V2.5 10−90.1320.00.00.999930.07.1e−5 [225]
S240925n2024-09-25
00:58:59
40; towards central Aquila
329±76
H,L,V4.0 10−200.00.00.00.7420.2580.0 [226]
S240930aa2024-09-30
00:58:59
457
1400±323
H,L,V3.1 10−190.00.00.00.999600.000401.7e−12 [227]
S240930du2024-09-30
23:46:14
708
3874±1404
H,L1.3 10−80.5210.00.00.6660.00.334 [228]
S241002e2024-10-02
03:05:59
1237
1607±557
L,V1.4 10−210.00.00.00.9970.0031.05e−14 [229]
S241006k2024-10-06
01:53:33
263
1899±441
H,L,V5.9 10−420.00.00.0~1.00.00.0 [230]
S241007bw2024-10-07
08:29:43
967
4355±1289
H,L,V1.6 10−80.6110.00.00.9880.00.012 [231]
S241009l2024-10-09
02:28:35
2544
6642±2029
H,L,V3.3 10−80.8510.00.00.9710.0040.025 [232]
S241009an2024-10-09
08:48:16
542
1208±365
H,L,V1.9 10−120.000110.00.00.9820.0172.9e−6 [233]
S241009em2024-10-09
22:04:55
813
3831±1633
H,L,V2.8 10−90.1490.00.00.9980.00.0025 [234]
S241011k2024-10-11
23:38:34
76; towards Ophiuchus or Serpens Cauda
232±51
H,V2.5 10−340.00.00.000220.9670.0331.1e−16 [235]
S241101ee2024-11-01
22:05:23
7670
2160±685
L,V1.4 10−110.000790.00.00.999980.02.0e−5 [236]
S241102br2024-11-02
12:40:58
28; towards Andromeda or Lacerta
364±54
H,L,V1.1 10−410.00.00.00670.8500.1441.1e−16 [237]
S241102cy2024-11-02
14:47:29
834
3443±1068
H,L,V1.5 10−80.5820.00.00.9990.00.0011 [238]
S241109p2024-11-09
03:33:17
1761
2282±1082
L,V6.0 10−110.00350.00.00.999920.08.3e−5 [239]
S241109bn2024-11-09
11:59:24
10138
603±159
H,V1.4 10−110.000820.00.1210.0470.8300.0026 The other component is a black hole. [240]
S241110br2024-11-10
12:41:23
102; towards Northern Centaurus
749±173
H,L,V4.7 10−90.2360.00.00.9420.0540.0038 [241]
S241111bn2024-11-11
11:15:52
424
1393±412
H,L7.1 10−300.00.00.0~1.00.00.0 [242]
S241113p2024-11-13
16:35:07
11825
1321±400
L,V1.5 10−148.4 10−70.00.0~1.00.04.0e−8 [243]
S241114y2024-11-14
02:47:11
152
2511±729
H,L,V9.1 10−145.2 10−60.00.0~1.00.02.4e−7 [244]
S241114bi2024-11-14
23:52:58
10127
752±195
L,V1.8 10−131.0 10−50.00.000490.9430.0564.2e−7 [245]
S241116cq2024-11-16
15:17:53
2292
5600±2218
H,L,V7.0 10−90.3300.00.00.999920.08.3e−5 [246]
S241122a2024-11-22
17:51:00
28549
2267±948
L6.4 10−80.9750.00.00.9550.00.045 Detected by only the Livingston detector, resulting in a bad sky localization. [247]
S241125n2024-11-25
01:01:16
76
4174±1591
H,L,V9.5 10−100.0530.00.00.999990.01.1e−5 [248]
S241127aj2024-11-27
06:10:08
53; mostly towards Musca or Southern Centaurus
1050±67
H,L,V6.5 10−390.00.00.0~1.00.00.0 [249]
S241129aa2024-11-29
02:18:32
269
2499±437
H,L,V4.0 10−200.00.00.00.9930.0060.0 [250]
S241130n2024-11-30
03:49:08
302
1790±518
H,L,V4.0 10−200.00.00.0~1.00.00.0 [251]
S241130be2024-11-30
11:04:22
1069
1226±321
H,L,V1.9 10−100.0110.00.00.9630.0370.00063 [252]
S241201ac2024-12-01
05:57:58
2300
7122±2366
H,L,V4.3 10−80.9170.00.00.9260.0410.033 [253]
S241210d2024-12-10
02:33:35
3777
5007±2073
H,L4.4 10−80.9200.00.00.9260.0410.033 [254]
S241210cw2024-12-10
06:06:06
495
2199±597
H,L,V6.3 10−100.0360.00.00.999950.05.1e−5 [255]
S241210fu2024-12-10
12:09:00
3326
3603±1378
H,L2.7 10−80.7910.00.00.9780.00140.021 [256]
S241225c2024-12-25
04:25:53
2264
666±137
L,V2.0 10−151.1 10−70.00.00.9640.0368.0e−9 [257]
S241225v2024-12-25
08:28:15
1192
2008±695
H,L2.2 10−210.00.00.0~1.00.01.5e−14 [258]
S241230bd2024-12-30
08:45:04
11129
2811±842
L,V6.2 10−143.6 10−60.00.0~1.00.01.6e−7 [259]
S241230ev2024-12-30
23:36:18
355
2940±1041
H,L,V2.2 10−80.7170.00.00.9840.00.016 [260]
S241231bg2024-12-31
05:41:33
125
830±159
H,L,V3.2 10−80.0180.00.00.9310.0670.0015 [261]
S250101k2025-01-01
01:12:05
455
3231±945
H,L,V5.6 10−80.9590.00.0790.8820.00.039 [262]
S250104v2025-01-04
01:51:22
1514
4932±1471
H,L,V9.5 10−135.5 10−50.00.0~1.00.01.7e−6 [263]
S250108eo2025-01-08
15:22:21
796
4306±1349
H,L,V1.8 10−110.00100.00.00.999970.02.6e−5 [264]
S250109f2025-01-09
01:05:41
243
3200±948
H,L,V2.9 10−120.000170.00.0~1.00.04.4e−6 [265]
S250109bi2025-01-09
07:45:52
2819
2255±734
H,V2.1 10−80.6920.00.00.9850.00.015 [266]
S250114ax2025-01-14
08:22:03
145; towards Ursa Major, Leo Minor, Leo, or Cancer
385±49
H,L4.1 10−270.00.00.0~1.00.00.0 [267]
S250118t2025-01-18
02:32:25
2332
6631±2213
H,L,V4.0 10−100.0230.00.00.9610.0390.00039 [268]
S250118az2025-01-18
05:58:02
1219
1336±410
H,L,V9.8 10−90.4300.00.000650.8070.1850.0073 [269]
S250118dp2025-01-18
17:05:23
798
1916±465
H,L5.6 10−250.00.00.00.9940.00630.0 [270]
S250119ag2025-01-19
02:51:38
538
3000±676
H,L,V3.3 10−131.9 10−50.00.0~1.00.01.5e−6 [271]
S250119cv2025-01-19
19:02:38
9; towards 67 Piscium
472±112
H,L,V4.0 10−200.00.00.0~1.00.00.0 [272]
S250202cu2025-02-02
18:49:02
4768
5196±2263
H,L1.5 10−80.5680.00.00.9480.0420.0099 [273]
S250204ax2025-02-04
05:52:59
318
2056±690
H,L,V3.2 10−100.0180.00.00.999740.00.00026 [274]
S250205bk2025-02-05
10:35:41
64; towards western Hydra
748±160
H,L,V9.5 10−100.0530.00.0140.9700.008150.0072 [275]
S250205ee2025-02-05
21:52:15
1574
2493±889
H,L1.8 10−90.1000.00.00.9980.00.0017 [276]
S250206dm2025-02-06
21:25:30
547
373±104
H,L1.3 10−90.0700.1430.2110.00.5680.077 The other component is a neutron star. [277]
S250207bg2025-02-07
11:56:45
80
508±95
L,V4.9 10−360.00.00.0~1.00.00.0 [278]
S250208ad2025-02-08
03:51:06
1128
4871±1417
H,L,V3.8 10−100.0210.00.00.999560.00.00044 [279]
S250211aa2025-02-11
02:25:46
248
1121±258
H,L,V4.7 10−180.00.00.00.9900.0103.2e-11 [280]
S250211be2025-02-11
04:35:43
91; towards Leo or Ursa Major
3337±1194
H,L,V1.8 10−80.6410.00.00.9870.00.013 [281]
S250226dl2025-02-26
22:48:38
1218
3361±1041
H,L1.2 10−126.7 10−50.00.0~1.00.02.4e-5 [282]
S250227e2025-02-27
00:13:02
210
2004±524
H,L,V2.6 10−120.000150.00.0~1.00.04.0e-6 [283]
S250304cb2025-03-04
06:22:45
1569
1768±541
H,L,V5.6 10−80.9600.00.00.9440.0180.038 [284]
S250319bu2025-03-19
06:25:36
989
4713±1546
H,L,V4.7 10−100.0270.00.00.999540.00.00046 [285]
S250326y2025-03-26
01:54:06
1460
5412±1720
H,L,V3.6 10−120.000200.00.0~1.00.06.2e-6 [286]
S250328ae2025-03-28
05:40:27
14; towards southwestern Leo
511±82
H,L,V3.2 10−100.0180.00.00.9340.0650.00151 [287]
S250331o2025-03-31
01:34:48
18; towards Triangulum
657±91
H,L,V3.2 10−100.0180.00.00.999720.00.00028 [288]
S250628am2025-06-28
18:23:19
287
902±223
H,L,V1.7 10−149.7 10−70.00.0~1.00.04.6e-8 [289]
S250629ae2025-06-29
05:50:36
3184
4550±1295
H,L,V3.2 10−80.8440.00.00.9780.00.022 [290]
S250629bs2025-06-29
12:13:04
3008
4847±1746
H,L4.3 10−80.9170.00.00.9400.00.060 [291]
S250701bp2025-07-01
20:34:40
24220
958±300
L3.1 10−170.00.00.0~1.00.01.8e-10 Detected by only the Livingston detector, resulting in a bad sky localization.
Chirp mass 99.98% likely to be between 22 and 44 Solar masses.
[292]
S250701bq2025-07-01
23:17:46
24219
556±171
L4.3 10−170.00.00.0~1.00.02.2e-10 Detected by only the Livingston detector, resulting in a bad sky localization.
Chirp mass 93.7% likely to be between 11 and 22 Solar masses.
[293]
S250702n2025-07-02
13:32:00
1944
2096±697
H,L1.8 10−80.6330.00.00.9890.00.011 Chirp mass 89.3% likely to be between 22 and 44 Solar masses (11-22 10.7%) [294]
S250704ab2025-07-04
04:30:48
77; towards central Auriga
536±124
H,L,V3.2 10−100.0180.00.1490.8240.1440.0020 Chirp mass 99.999% likely to be between 5.5 and 11 Solar masses [295]
S250705cb2025-07-05
16:29:56
510
1209±336
H,L,V9.5 10−100.0500.00.00.9950.00.0054 Chirp mass 86.2% likely to be between 5.5 and 11 Solar masses (11-22 13.6%) [296]
S250711q2025-07-11
03:27:25
2964
9738±2925
H,L,V1.6 10−90.0860.00.00.99860.00.0014 Chirp mass 59.0% likely to be between 22 and 44 Solar masses (44-88 41.0%) [297]
S250712cd2025-07-12
14:25:32
306
2177±664
H,L,V2.7 10−110.00150.00.00.999890.00.00011 Chirp mass 99.87% likely to be between 22 and 44 Solar masses [298]
S250725j2025-07-25
04:09:44
28; towards northern Lupus
478±107
H,L,V4.3 10−110.00240.00.00.999950.05.3e-5 Chirp mass 99.98% likely to be between 11 and 22 Solar masses [299]
S250725l2025-07-25
04:20:50
1990
2186±673
H,L,V3.0 10−80.8190.00.00.9850.000620.015 Chirp mass 98.9% likely to be between 11 and 22 Solar masses [300]
S250726ak2025-07-26
08:28:15
361
3333±1448
H,L,V4.7 10−120.000270.00.00.999980.02.3e-5 Chirp mass 99.2% likely to be between 22 and 44 Solar masses [301]
S250727cl2025-07-27
18:03:29
379
1817±454
H,L,V4.0 10−200.00.00.0~1.00.00.0 Chirp mass 74.2% likely to be between 22 and 44 Solar masses (11-22 25.8%) [302]
S250727dc2025-07-27
20:01:48
23.3; towards eastern Columba
1172±256
H,L,V1.1 10−180.00.00.0~1.00.08.2e-12 Chirp mass 99.999% likely to be between 22 and 44 Solar masses [303]
S250802dn2025-08-02
20:25:12
3209
3070±1219
H,L5.5 10−80.9570.00.00.9270.00.073 Chirp mass 91.1% likely to be between 22 and 44 Solar masses [304]
S250810ck2025-08-10
14:23:57
180
621±129
H,V5.4 10−200.00.00.000530.9050.0944.4e-13 Chirp mass 100% likely to be between 5.5 and 11 Solar masses [305]
S250813k2025-08-13
02:12:00
18; towards border of
Ursa Major, Camelopardalis, and Draco
932±209
H,L,V1.3 10−100.00720.00.00.9970.00.0029 Chirp mass 99.993% likely to be between 22 and 44 Solar masses [306]
S250818t2025-08-18
02:08:58
377
1311±350
H,L,V1.7 10−110.000990.00.00.9830.01747.4e-5 Chirp mass 54.0% likely to be between 5.5 and 11 Solar masses (11-22 46.0%) [307]
S250827l2025-08-27
01:27:57
1145
2132±580
H,L,V3.2 10−100.0180.00.00.999980.02.0e-5 Chirp mass 87.8% likely to be between 22 and 44 Solar masses (11-22 12.2%) [308]
S250827fo2025-08-27
22:29:40
967
1064±295
H,L,V2.3 10−110.00130.00.00.9430.0579.2e-5 Chirp mass 92.5% likely to be between 5.5 and 11 Solar masses [309]
S250830m2025-08-30
03:27:09
3130
3705±1112
H,L1.2 10−80.4950.00.00.9790.00.021 Chirp mass 99.7% likely to be between 22 and 44 Solar masses [310]
S250830bp2025-08-30
10:24:18
10.5; towards Western Auriga or Eastern Perseus
429±100
H,L,V3.2 10−100.0180.00.1320.7020.1650.0017 Chirp mass 99.8% likely to be between 5.5 and 11 Solar masses [311]

See also

Notes

  1. The detection date of a GW event is indicated by its designation; i.e., event GW150914 was detected on 2015-09-14.
  2. The relatively large and distant area of the sky within which it is claimed to be possible to localize the source.
  3. 1 Mpc is approximately 3.26 Mly.
  4. c2M is about 1.8×103  foe ; 1.8×1047  J ; 1.8×1054  erg ; 4.3×1046  cal ; 1.7×1044  BTU ; 5.0×1040  kWh, or 4.3×1037 tonnes of TNT.
  5. The chirp mass is the binary parameter most relevant to the evolution of the inspiral gravitational waveform, and thus is the mass that can be measured most accurately. It is related to, but less than, the geometric mean of the binary masses, according to , thus ranging from ~87% of when the masses are the same to ~78% when they differ by an order of magnitude.
  6. The dimensionless effective inspiral spin parameter is: [14] where is the mass of a black hole, is its spin, and is the angle between the orbital angular momentum and a merging black hole's spin (ranging from when aligned to when antialigned). It is the mass-weighted linear combination of the components of the black holes' spins aligned with the orbital axis [14] [13] and has values ranging from −1 to 1 (the extremes correspond to situations with both black hole spins exactly antialigned and aligned, respectively, with orbital angular momentum). [15] This is the spin parameter most relevant to the evolution of the inspiral gravitational waveform, and it can be measured more accurately than those of the premerger BHs. [16]
  7. Values of the dimensionless spin parameter c J/G M 2 for a black hole range from zero to a maximum of one. The macroscopic properties of an isolated astrophysical (uncharged) black hole are fully determined by its mass and spin. Values for other objects can potentially exceed one. The largest value known for a neutron star is ≤ 0.4, and commonly used equations of state would limit that value to < 0.7. [17]
  8. Spin estimate is 0.26+0.52
    −0.24
    . [18]
  9. Spin estimate is 0.32+0.54
    −0.29
    . [18]
  10. Based on a descending spin-down GW-chirp lasting 3.7 seconds post-merger, a hyper-massive neutron star was produced in delayed gravitational collapse to a Kerr black hole after 0.92 seconds. [28] [29]
  11. Besides the loss of mass due to GW emission that occurred during the merger, the event is thought to have ejected 0.05±0.02 M of material. [30]
  12. 1 Mpc is approximately 3.26 Mly.
  13. Which instruments observed the event. (H = LIGO Hanford, L=LIGO Livingston, V=Virgo)
  14. The area of the sky within which it was possible to localize the source.
  15. 1 Mpc is approximately 3.26 Mly.
  16. Which instruments observed the event. (H = LIGO Hanford, L=LIGO Livingston, V=Virgo)
  17. The chance a random signal of this significance would occur at any point in O3's 11-month run. Calculated by 1 - (1-false alarm rate in Hz)28,512,000. This is not the chance of the given signal being 'real' or not: Background contamination (such as earthquakes) can cause statistically significant signals as well, and although four detections have a >50% chance to have occurred randomly in O3, there is only a 19.4% chance that none of these signals would be real.
  18. Probability that both components have mass < 3 M
  19. Probability that one component has mass < 3 M and the other has mass > 5 M
  20. Probability that both components have mass > 5 M
  21. Probability that at least one component has a mass in the range 3-5 M, between those of known neutron stars and black holes, a range sometimes identified as the "lower" mass gap
  22. Probability that the source is terrestrial or non-cosmological (e.g. foreground noises and signals [e.g. "noise"] or a technical/systematic error ["glitch"])
  23. 1 2 3 The following events had a pAstro of over 50%, but were at a low significance and thus not validated by the LIGO-Virgo collaboration. Many of these events are likely real, but at least some are likely false positives:
    2023 May: S230524b (BBH, pAstro = 0.725), S230525a (BBH, pAstro = 0.724), S230527bv (BBH, pAstro = 0.882), S230528a (NSMG, pAstro = 0.643), S230528bt (BBH, pAstro = 0.880)
    June: S230604z (BBH, pAstro = 0.748), S230606z (BBH, pAstro = 0.835), S230609a (BBH, pAstro = 0.956), S230615av (BBH, pAstro = 0.912), S230615az (BNS, pAstro = 0.847), S230623at (BBH, pastro = 0.707), S230628aj (BBH, pAstro = 0.694)
    July: S230704bd (BBH, pAstro = 0.755), S230711b (BBH, pAstro = 0.792), S230716o (BBH, pAstro = 0.750), S230725am (BBH, pAstro = 0.502), S230728ap (BBH, pAstro = 0.940)
    August: S230822ac (BBH, pAstro = 0.813), S230830q (BBH, pAstro = 0.923)
    September: S230902af (BBH, pAstro = 0.798), S230904bg (BBH, pAstro = 0.688)
    October: S231004bq (BBH, pAstro = 0.708), S231007w (BBH, pAstro = 0.746), S231025a (BNS, pAstro = 0.588), S231025ap (BBH, pAstro = 0.830)
    November: S231124z (BBH, pAstro = 0.647)
    December: S231223bg (BBH, pAstro = 0.690)
    2024 January: S240116p (BBH, pAstro = 0.789)
    April: S240407v (BBH, pAstro = 0.882), S240420dc (BBH, pAstro = 0.887), S240427am (BBH, pAstro = 0.639)
    May: S240513cx (BBH, pAstro = 0.738), S240525dy (BBH, pAstro = 0.885), S240526ak (BBH, pAstro = 0.626), S240527dh (BBH, pAstro = 0.915), S240531aa (BBH, pAstro = 0.905)
    June: S240613z (BBH, pAstro = 0.923), S240619z (BBH, pAstro = 0.739), S240621ch (BBH, pAstro = 0.680), S240627co (BBH, pAstro = 0.713)
    July: S240701bn (BBH, pAstro = 0.824)
    September: S240901ew (BBH, pAstro = 0.881), S240907ah (BBH, pAstro = 0.910), S240913bs (BBH, pAstro = 0.875), S240914db (BBH, pAstro = 0.608), S240915aw (BBH, pAstro = 0.678), S240921s (BBH, pAstro = 0.736), S240921cs (BBH, pAstro = 0.702)
    October: S241031cn (BBH, pAstro = 0.583)
    November: S241101s (BBH, pAstro = 0.800), S241106ae (BBH, pAstro = 0.927), S241111u (BBH, pAstro = 0.703), S241115cn (BBH, pAstro = 0.626), S241124w (BBH, pAstro=0.913), S241128cf (BBH, pAstro=0.648)
    December: S241210ba (BBH, pAstro = 0.632)
    S241219gz (BBH, pAstro = 0.771)
    2025 January: S250103ei (BBH, pAstro = 0.697), S250105dn (BBH, pAstro = 0.753), S250120ah (BBH, pAstro = 0.901), S250123l (BBH, pAstro = 0.809), S250129p (BBH, pAstro = 0.798)
    February: S250204ar (BBH, pAstro = 0.779), S250207da (BBH, pAstro = 0.707), S250214bv (BBH, pAstro = 0.635), S250228p (BBH, pAstro = 0.798)
    March: S250304df (BBH, pAstro = 0.731), S250309co (BBH, pAstro = 0.665), S250313j (BBH, pAstro = 0.646), S250313aj (BBH, pAstro = 0.861), S250315ab (BBH, pAstro = 0.765), S250318bl (MGBH, pAstro = 0.584), S250321l (BBH, pAstro = 0.721), S250327u (BBH, pAstro = 0.635)
    June: S250614bb (BBH, pAstro = 0.648), S250619ca (BBH, pAstro = 0.787)
    July: S250717x (BBH, pAstro = 0.789)
    August: S250801h (BBH, pAstro = 0.665), S250805eg (BBH, pAstro = 0.833), S250813ak (BBH, pAstro = 0.660), S250817fb (BBH, pAstro = 0.703), S250822as (BBH, pAstro = 0.713), S250828ch (BBH, pAstro = 0.773)
  24. The area of the sky within which it was possible to localize the source.
  25. 1 Mpc is approximately 3.26 Mly.
  26. Which instruments observed the event. (H = LIGO Hanford, L=LIGO Livingston, V=Virgo)
  27. The chance a random signal of this significance would occur at any point in O4's 20-month run. Calculated by 1 - (1-false alarm rate in Hz)57,456,000. This is not the chance of the given signal being 'real' or not: Even if there is a 90% chance of O4 having random noise eventually reach a certain level of significance, the chance of such noise occurring 100 separate times in the same period is still very low (in this example, around 0.0026%).
  28. Probability that both components have mass < 3 M
  29. Probability that one component has mass < 3 M and the other has mass > 5 M
  30. Probability that both components have mass > 5 M
  31. Probability that at least one component has a mass in the range 3-5 M, between those of known neutron stars and black holes, a range sometimes identified as the "lower" mass gap
  32. Probability that the source is terrestrial or non-cosmological (e.g. foreground noises and signals [e.g. "noise"] or a technical/systematic error ["glitch"])

References

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  245. "Superevent info - S241114bi". LIGO. Retrieved 15 November 2024.
  246. "Superevent info - S241116cq". LIGO. Retrieved 16 November 2024.
  247. "Superevent info - S241122a". LIGO. Retrieved 22 November 2024.
  248. "Superevent info - S241125n". LIGO. Retrieved 26 November 2024.
  249. "Superevent info - S241127aj". LIGO. Retrieved 27 November 2024.
  250. "Superevent info - S241129aa". LIGO. Retrieved 29 November 2024.
  251. "Superevent info - S241130n". LIGO. Retrieved 30 November 2024.
  252. "Superevent info - S241130be". LIGO. Retrieved 1 December 2024.
  253. "Superevent info - S241201ac". LIGO. Retrieved 1 December 2024.
  254. "Superevent info - S241210d". LIGO. Retrieved 10 December 2024.
  255. "Superevent info - S241210cw". LIGO. Retrieved 10 December 2024.
  256. "Superevent info - S241210fu". LIGO. Retrieved 10 December 2024.
  257. "Superevent info - S241225c". LIGO. Retrieved 25 December 2024.
  258. "Superevent info - S241225v". LIGO. Retrieved 25 December 2024.
  259. "Superevent info - S241230bd". LIGO. Retrieved 30 December 2024.
  260. "Superevent info - S241230ev". LIGO. Retrieved 30 December 2024.
  261. "Superevent info - S241231bg". LIGO. Retrieved 31 December 2024.
  262. "Superevent info - S250101k". LIGO. Retrieved 1 January 2025.
  263. "Superevent info - S250104v". LIGO. Retrieved 4 January 2025.
  264. "Superevent info - S250108eo". LIGO. Retrieved 9 January 2025.
  265. "Superevent info - S250109f". LIGO. Retrieved 9 January 2025.
  266. "Superevent info - S250109bi". LIGO. Retrieved 9 January 2025.
  267. "Superevent info - S250114ax". LIGO. Retrieved 14 January 2025.
  268. "Superevent info - S250118t". LIGO. Retrieved 18 January 2025.
  269. "Superevent info - S250118az". LIGO. Retrieved 18 January 2025.
  270. "Superevent info - S250118dp". LIGO. Retrieved 18 January 2025.
  271. "Superevent info - S250119ag". LIGO. Retrieved 19 January 2025.
  272. "Superevent info - S250119cv". LIGO. Retrieved 19 January 2025.
  273. "Superevent info - S250202cu". LIGO. Retrieved 3 February 2025.
  274. "Superevent info - S250204ax". LIGO. Retrieved 4 February 2025.
  275. "Superevent info - S250205bk". LIGO. Retrieved 5 February 2025.
  276. "Superevent info - S250205ee". LIGO. Retrieved 5 February 2025.
  277. "Superevent info - S250206dm". LIGO. Retrieved 6 February 2025.
  278. "Superevent info - S250207bg". LIGO. Retrieved 7 February 2025.
  279. "Superevent info - S250208ad". LIGO. Retrieved 8 February 2025.
  280. "Superevent info - S250211aa". LIGO. Retrieved 11 February 2025.
  281. "Superevent info - S250211be". LIGO. Retrieved 11 February 2025.
  282. "Superevent info - S250226dl". LIGO. Retrieved 27 February 2025.
  283. "Superevent info - S250227e". LIGO. Retrieved 27 February 2025.
  284. "Superevent info - S250304cb". LIGO. Retrieved 4 March 2025.
  285. "Superevent info - S250319bu". LIGO. Retrieved 19 March 2025.
  286. "Superevent info - S250326y". LIGO. Retrieved 26 March 2025.
  287. "Superevent info - S250328ae". LIGO. Retrieved 28 March 2025.
  288. "Superevent info - S250331o". LIGO. Retrieved 15 May 2025.
  289. "Superevent info - S250628am". LIGO. Retrieved 29 June 2025.
  290. "Superevent info - S250629ae". LIGO. Retrieved 29 June 2025.
  291. "Superevent info - S250629bs". LIGO. Retrieved 29 June 2025.
  292. "Superevent info - S250701bp". LIGO. Retrieved 2 July 2025.
  293. "Superevent info - S250701bq". LIGO. Retrieved 2 July 2025.
  294. "Superevent info - S250702n". LIGO. Retrieved 2 July 2025.
  295. "Superevent info - S250704ab". LIGO. Retrieved 4 July 2025.
  296. "Superevent info - S250705cb". LIGO. Retrieved 5 July 2025.
  297. "Superevent info - S250711q". LIGO. Retrieved 11 July 2025.
  298. "Superevent info - S250712cd". LIGO. Retrieved 12 July 2025.
  299. "Superevent info - S250725j". LIGO. Retrieved 25 July 2025.
  300. "Superevent info - S250725l". LIGO. Retrieved 25 July 2025.
  301. "Superevent info - S250726ak". LIGO. Retrieved 28 July 2025.
  302. "Superevent info - S250727cl". LIGO. Retrieved 28 July 2025.
  303. "Superevent info - S250727dc". LIGO. Retrieved 28 July 2025.
  304. "Superevent info - S250802dn". LIGO. Retrieved 3 August 2025.
  305. "Superevent info - S250810ck". LIGO. Retrieved 11 August 2025.
  306. "Superevent info - S250813k". LIGO. Retrieved 13 August 2025.
  307. "Superevent info - S250818t". LIGO. Retrieved 18 August 2025.
  308. "Superevent info - S250827l". LIGO. Retrieved 27 August 2025.
  309. "Superevent info - S250827fo". LIGO. Retrieved 27 August 2025.
  310. "Superevent info - S250830m". LIGO. Retrieved 30 August 2025.
  311. "Superevent info - S250830bp". LIGO. Retrieved 30 August 2025.