GRB 261008A
GCN Circular 45866
Subject
GRB 261008A: Fermi GBM Final Real-time Localization
Date
2026-10-08T18:29:38Z (10 hours ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely SHORT GRB
At 18:19:08 UT on 8 Oct 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 261008A (trigger 813176353.292218 / 261008763).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 310.4, Dec = 11.1 (J2000 degrees, equivalent to J2000 20h 41m, 11d 05'), with a statistical uncertainty of 12.4 degrees.
The angle from the Fermi LAT boresight is 85.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261008763/quicklook/glg_skymap_all_bn261008763.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261008763/quicklook/glg_healpix_all_bn261008763.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261008763/quicklook/glg_lc_medres34_bn261008763.gif