Fermi GBM detects likely long GRB 261026B, followed by observations from other telescopes

AI Summary

On October 26, 2026, Fermi GBM detected a likely long gamma-ray burst (GRB 261026B) at RA = 61.8, Dec = -1.7 with a statistical uncertainty of 1.4 degrees. Follow-up observations were conducted by AstroSat CZTI, NuSTAR, and MASTER-OAFA robotic telescope.

Measurements

Notices (1)

Fermi GBM — GRB · Mon, 26 Oct 2026 07:21:12 GMT

GCN Circulars (4)

GCN-46066 — GRB 261026B · Wed, 28 Oct 2026 09:11:49 GMT
The AstroSat CZTI detector observed a gamma-ray burst (GRB 261026B) on October 26, 2026, at 07:21:19.60 UTC, which was also detected by Fermi, NuSTAR, and SVOM. The burst was detected in both the 20-200 keV and 100-500 keV energy ranges, with significant peak count rates and total counts recorded.

GCN-46052 — GRB 261026B · Mon, 26 Oct 2026 22:01:21 GMT
The NuSTAR SINGS working group detected prompt emission from the long-duration GRB 261026B, identified through a blind search using the CsI shield rates. This GRB was also detected by Fermi-GBM, SVOM-GRM, and KONUS-Wind, with a single-peaked burst lasting about 20 seconds and a peak count rate of approximately 1500 counts per second.

GCN-46036 — GRB 261026B · Mon, 26 Oct 2026 09:01:29 GMT
The MASTER-OAFA robotic telescope in Argentina began observing the Fermi GRB 261026B error box 549 seconds after the notice time, with an upper limit magnitude of 18.6. The observations included multiple exposures and coordinates, with varying upper limits recorded over time.

GCN-46032 — GRB 261026B · Mon, 26 Oct 2026 07:31:46 GMT
The Fermi Gamma-ray Burst Monitor (GBM) detected a likely long gamma-ray burst (GRB 261026B) on October 26, 2026, at 07:21:12 UT. The event was located at RA = 61.8, Dec = -1.7 (J2000) with a statistical uncertainty of 1.4 degrees.