STARITHM
Fermi GBM detected a likely short GRB (GRB 261013A) on Oct 13, 2026
AI Summary
The Fermi Gamma-ray Burst Monitor triggered on a short gamma-ray burst at 13:57:44 UT on October 13, 2026 (trigger 813592669). The burst was localized to RA = 138.6°, Dec = 17.6° with a statistical uncertainty of 15.4 degrees. Energy range spans 44-280 keV with a burst significance of 4.2-4.4 sigma and duration of 0.256 seconds. Machine classification suggests AGN origin (92% probability) rather than a true GRB, introducing ambiguity in the source nature despite the short burst morphology.
Measurements
| Event ID | 813592669 |
|---|---|
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | medium |
| Trigger time (UTC) | Tue, 13 Oct 2026 13:57:44 GMT |
| Right ascension (J2000) | 138.62° |
| Declination (J2000) | 17.64° |
| Position error radius | 15.37° |
| GCN notices | 4 |
| GCN circulars | 1 |
Notices (1)
Fermi GBM — GRB · Tue, 13 Oct 2026 13:57:44 GMT
GCN Circulars (1)
GCN-45943 — GRB 261013A
· Tue, 13 Oct 2026 14:08:22 GMT
The Fermi Gamma-ray Burst Monitor (GBM) detected a likely short gamma-ray burst (GRB 261013A) on October 13, 2026, at 13:57:44 UT. The event was localized to RA = 138.6, Dec = 17.6 (J2000) with a statistical uncertainty of 15.4 degrees.
AI summary generated Tue, 13 Oct 2026 16:47:36 GMT.