Fermi GBM detected likely short GRB 260910B; optical counterparts identified by GOTO
AI Summary
Fermi GBM triggered on a likely short gamma-ray burst (GRB 260910B) at 2026-09-10 23:16:44 UT with trigger ID 810775009. The burst was localized to RA=260.8°, Dec=-0.7° with a 6.2° statistical uncertainty, though Fermi's automated classification initially favored AGN (93% probability). GOTO optical observations conducted 9.77-11.23 hours post-trigger identified two tentative optical counterparts (GOTO26jjj at mag 20.28 and GOTO26jjg at mag 20.58) within the 90% localization contour, spatially coincident with galaxies in the region.
Measurements
| Event ID | 810775009 |
|---|---|
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | medium |
| Trigger time (UTC) | Thu, 10 Sep 2026 23:16:44 GMT |
| Right ascension (J2000) | 260.77° |
| Declination (J2000) | -0.67° |
| Position error radius | 6.16° |
| GCN notices | 5 |
| GCN circulars | 2 |
Notices (1)
Fermi GBM — GRB · Thu, 10 Sep 2026 23:16:44 GMT
GCN Circulars (2)
GCN-45552 — GRB 260910B
· Fri, 11 Sep 2026 12:41:32 GMT
The Gravitational-wave Optical Transient Observer (GOTO) has identified two tentative optical counterparts to the gamma-ray burst GRB 260910B, detected within the 90% probability contour of the Fermi/GBM localisation region. These candidates, GOTO26jjj and GOTO26jjg, were observed at magnitudes of 20.28 and 20.58, respectively, and are spatially coincident with galaxies in the region.
GCN-45550 — GRB 260910B
· Thu, 10 Sep 2026 23:27:13 GMT
The Fermi Gamma-ray Burst Monitor (GBM) detected a likely short gamma-ray burst (GRB 260910B) at 23:16:44 UT on 10 Sep 2026. The event was located at RA = 260.8, Dec = -0.7 (J2000) with a statistical uncertainty of 6.2 degrees, and the angle from the Fermi LAT boresight was 94.0 degrees.
AI summary generated Tue, 15 Sep 2026 05:23:29 GMT.