Fermi GBM detects likely long GRB 260805B with significant gamma-ray emission

AI Summary

GRB 260805B was detected by Fermi GBM on August 5, 2026, with a high significance gamma-ray burst. The event was localized to RA = 259.42, Dec = 64.59 (J2000) with a statistical uncertainty of 2.15 degrees, and was also independently confirmed by the Glowbug telescope on the International Space Station.

Measurements

Notices (1)

Fermi GBM — GRB · Wed, 05 Aug 2026 11:36:52 GMT

GCN Circulars (3)

GCN-45291 — GRB 260805B · Wed, 05 Aug 2026 19:41:57 GMT
The Glowbug gamma-ray telescope on the International Space Station detected a gamma-ray burst (GRB 260805B) on 2026-08-05, which was also detected by Fermi/GBM. The burst had a duration of 14.6 seconds and a significance of about 20.3 sigma, with a broad emission profile.

GCN-45289 — GRB 260805B · Wed, 05 Aug 2026 15:19:19 GMT
The Fermi Gamma-ray Burst Monitor (GBM) detected a likely long gamma-ray burst (GRB 260805B) on August 5, 2026, at 11:36:52.81 UT. The burst was located at RA = 259.42, Dec = 64.59 (J2000) with a statistical uncertainty of 2.15 degrees, and the angle from the Fermi LAT boresight was 31 degrees.

GCN-45287 — GRB 260805B · Wed, 05 Aug 2026 12:19:46 GMT
A gamma-ray burst (GRB 260805B) was detected by the Fermi Gamma-ray Burst Monitor on August 5, 2026, at 11:36:52 GMT. The event was localized using the BALROG algorithm, with a best-fit position at RA(2000.0) = 255.8 deg and Decl.(2000.0) = 67.9 deg, and an estimated error radius of 2.9 degrees plus an additional 2 degrees systematic error.