Fermi GBM detects GRB 260312B with a long duration of 11.8 seconds

AI Summary

The Fermi Gamma-ray Burst Monitor (GBM) detected a long gamma-ray burst (GRB 260312B) on March 12, 2026, with a measured duration of approximately 11.8 seconds. The burst was also detected by other instruments such as GRID, AstroSat CZTI, and Glowbug, providing a comprehensive dataset for further analysis.

Notices (2)

Fermi — GRB · Thu, 12 Mar 2026 04:16:46 GMT

Unknown — OTHER · Thu, 12 Mar 2026 04:16:46 GMT

GCN Circulars (6)

GCN-44018 — GRB 260312B · Sun, 15 Mar 2026 11:40:03 GMT
GRID Collaboration at Tsinghua University reports the detection of long-duration gamma-ray burst (GRB) 260312B on March 12, 2026, with a measured burst duration of approximately 11.8 seconds ± 2.3 seconds in the 30-2000 keV range. The event was also detected by Fermi GBM, MASTER-Kislovodsk, BALROG, and AstroSat CZTI. The GRID light curve can be found online.

GCN-43989 — GRB 260312B · Fri, 13 Mar 2026 13:07:30 GMT
Astronomers reporting for the AstroSat CZTI collaboration have detected a long gamma-ray burst (GRB 260312B) using the AstroSat CZTI instrument. The burst was also detected by Fermi GBM and Glowbug. The source was detected in the 20-200 keV energy range, with a peak count rate of 131 counts/s and a total of 605 counts. The T90 duration was measured to be 14 seconds. The CZTI is a TIFR-led consortium project funded by the Indian Space Research Organisation.

GCN-43976 — GRB 260312B · Thu, 12 Mar 2026 23:50:31 GMT
The Glowbug gamma-ray telescope on the International Space Station detected GRB 260312B, a gamma-ray burst with a duration of 12.3 seconds and a total significance of 43 sigma. The light curve exhibited peaks at approximately 1 second and 7 seconds after the burst onset. The detection was also confirmed by Fermi/GBM. This preliminary analysis used data from Glowbug, a NASA-funded technology demonstrator developed by the U.S. Naval Research Laboratory.

GCN-43973 — GRB 260312B · Thu, 12 Mar 2026 16:45:30 GMT
The MASTER-Kislovodsk robotic telescope in Russia initiated observations of Fermi GRB 260312B 24 seconds after the gamma-ray burst trigger time. The team reported upper limits of 16.1, 16.5, 16.8, and 16.6 mag in clear band for the first four observations. The observations will continue.

GCN-43970 — GRB 260312B · Thu, 12 Mar 2026 10:16:35 GMT
The Fermi Gamma-ray Burst Monitor (GBM) trigger 795001611 from March 12, 2026, has been localized by the BALROG tool with a best-fit position of RA(2000.0) = 26.3 deg and Decl.(2000.0) = -8.3 deg, with statistical and systematic errors. The event occurred at the Max Planck Institute for Extraterrestrial Physics (MPE) and its significance is the determination of the precise location of the gamma-ray burst, enabling further analysis and follow-up observations.

GCN-43969 — GRB 260312B · Thu, 12 Mar 2026 09:57:18 GMT
The Fermi Gamma-ray Burst Monitor (GBM) has detected a long gamma-ray burst (GRB 260312B) at 09:46:46 UT on March 12, 2026. The preliminary location of the burst is at RA = 25.9, Dec = -3.9 (J2000 degrees) with a statistical uncertainty of 1.9 degrees. The angle from the Fermi Large Area Telescope (LAT) boresight is 67.0 degrees.