Fermi GBM detects GRB 260310B with a likely long duration and significant gamma-ray emission.

AI Summary

The burst was localized to RA = 119.6, Dec = 12.9 with a 6.7-degree uncertainty. Follow-up observations by GECAM-B confirmed multiple pulses over 46 seconds, while MASTER-Kislovodsk provided early optical upper limits.

Notices (2)

Fermi — GRB · Tue, 10 Mar 2026 16:11:23 GMT

Unknown — OTHER · Tue, 10 Mar 2026 16:11:23 GMT

GCN Circulars (3)

GCN-43967 — GRB 260310B · Thu, 12 Mar 2026 05:08:05 GMT
GECAM-B detected a gamma-ray burst (GRB 260310B) at 21:41:26 UTC on March 10, 2026. The burst, also detected by Fermi/GBM, consisted of multiple pulses with a duration of approximately 46 seconds and a duration uncertainty of +/- 6-7 seconds. The GECAM mission, consisting of three micro-satellites, is a Chinese Academy of Sciences project designed to detect and study high-energy electromagnetic counterparts to gravitational waves.

GCN-43956 — GRB 260310B · Tue, 10 Mar 2026 22:30:30 GMT
The MASTER-Kislovodsk robotic telescope in Russia began observing Fermi GRB 260310B 552 seconds after the trigger time, reporting upper limits on magnitudes ranging from 16.5 to 16.9 in clear band for various observations. The galactic coordinates of the GRB are b = 21 deg., l = 209 deg.

GCN-43955 — GRB 260310B · Tue, 10 Mar 2026 21:49:02 GMT
The Fermi Gamma-ray Burst Monitor (GBM) has detected a long gamma-ray burst (GRB 260310B) at a calculated location of RA = 119.6, Dec = 12.9 with a statistical uncertainty of 6.7 degrees. The angle from the Fermi Large Area Telescope (LAT) boresight is 68.0 degrees. The team at MSFC/Fermi-GBM has reported this event and provided links to the skymap, HEALPix FITS file, and light curve.