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GRB 260921B detected by Fermi GBM and GECAM-B.
AI Summary
The Fermi Gamma-ray Burst Monitor (GBM) detected a long gamma-ray burst (GRB 260921B) on September 21, 2026, with a well-localized position at RA = 62.12, Dec = 31.21 (J2000) within a statistical uncertainty of 2.22 degrees. GECAM-B satellite also reported multiple pulses from the burst lasting about 46 seconds.
Measurements
| Event | GRB 260921B |
|---|---|
| Event ID | 811719882 |
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | high |
| Trigger time (UTC) | Mon, 21 Sep 2026 21:44:37 GMT |
| Right ascension (J2000) | 62.12° |
| Declination (J2000) | 31.21° |
| Position error radius | 2.22° (2.22°) |
| Position from | notice FERMI_GBM_FIN_POS |
| GCN notices | 7 |
| GCN circulars | 2 |
Every localisation reported in Circulars (1)
| Instrument | Of | Error | Circular |
|---|---|---|---|
| Fermi-GBM | burst | 2.22° (1-sigma statistical) | GCN 45685 |
Notices (1)
Fermi GBM — GRB · Mon, 21 Sep 2026 21:44:37 GMT
GCN Circulars (2)
GCN-45805 — GRB 260921B
· Sat, 03 Oct 2026 13:36:38 GMT
The GECAM-B satellite detected a gamma-ray burst (GRB 260921B) on September 21, 2026, at 21:44:41.950 UTC, which was also observed by Fermi/GBM. The burst consisted of multiple pulses with a duration of approximately 46 seconds.
GCN-45685 — GRB 260921B
· Mon, 21 Sep 2026 23:19:25 GMT
The Fermi Gamma-ray Burst Monitor (GBM) detected a likely long gamma-ray burst (GRB 260921B) on September 21, 2026, at 21:44:37.15 UT. The event was localized to RA = 62.12, Dec = 31.21 (J2000) with a statistical uncertainty of 2.22 degrees.
AI summary generated Thu, 05 Nov 2026 13:22:18 GMT.