 GRB 250702B (circled in red), taken on 3 July with the VLT’s HAWK-I infrared camera | |
| Event type | Gamma ray burst |
|---|---|
| Right ascension | 18h 58m 45.565s |
| Declination | −7° 52′ 26.42″ |
GRB 250702BDE was a series of three distinct gamma-ray bursts (GRB) from the same source. The first is GRB 250702B, the second is GRB 250702D, and the third is GRB 250702E. It is also exceptional in that it repeated several times and appeared to be periodic. [1] [2] [3] [4]
It was initially detected by the Fermi Gamma-ray Space Telescope on July 2, 2025. About 10 hours earlier, the Einstein Probe had detected an associated X-ray transient. [1] [2] [5]
It was initially believed to have originated inside the Milky Way. A day after the initial detection, the Very Large Telescope showed the source to be extra-galactic; this was later confirmed by the Hubble Space Telescope. [2] [3]
The first of three, GRB 250702B, was followed 2,825 seconds later by GRB 250792D. The third, GRB 250702E followed the second 11,304 later. This is almost exactly four times the 2,825 second period between the first two. It is just four seconds off. This suggests the series was triggered by an object in orbit around a black hole. [6]
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