STARITHM
Fermi GBM detects GRB 261021A with a significant gamma-ray burst
AI Summary
On October 21, 2026, Fermi GBM detected GRB 261021A, a long-duration gamma-ray burst with a significance of 14.3 sigma. The event was also independently confirmed by the Glowbug telescope on the ISS.
Measurements
| Event ID | 814301594 |
|---|---|
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | high |
| Trigger time (UTC) | Wed, 21 Oct 2026 18:53:09 GMT |
| Right ascension (J2000) | 245.71° |
| Declination (J2000) | 42.86° |
| Position error radius | 6.08° |
| GCN notices | 5 |
| GCN circulars | 2 |
Notices (1)
Fermi GBM — GRB · Wed, 21 Oct 2026 18:53:09 GMT
GCN Circulars (2)
GCN-46070 — GRB 261021A
· Wed, 28 Oct 2026 22:29:43 GMT
The Glowbug gamma-ray telescope on the International Space Station detected GRB 261021A, a gamma-ray burst also observed by Fermi/GBM, with a double-peaked light curve and a duration of 14.3 seconds. The detection is significant at about 16.6 sigma, but the results are preliminary due to the lack of detailed characterization of the surrounding passive structure of the ISS.
GCN-46007 — GRB 261021A
· Wed, 21 Oct 2026 19:03:40 GMT
The Fermi Gamma-ray Burst Monitor (GBM) detected a likely long gamma-ray burst (GRB 261021A) on October 21, 2026, at 18:53:09 UT. The event was located at RA = 245.7, Dec = 42.9 with a statistical uncertainty of 6.1 degrees.
AI summary generated Thu, 29 Oct 2026 17:37:54 GMT.