GCN Circular 46185
Subject
GRB 261108A: Fermi GBM Final Real-time Localization
Event
Date
2026-11-08T01:24:01Z (12 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 LONG GRB
At 01:13:19 UT on 8 Nov 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 261108A (trigger 815793204.346972 / 261108051).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 338.7, Dec = -22.4 (J2000 degrees, equivalent to J2000 22h 34m, -22d 23'), with a statistical uncertainty of 15.6 degrees.
The angle from the Fermi LAT boresight is 40.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261108051/quicklook/glg_skymap_all_bn261108051.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/bn261108051/quicklook/glg_healpix_all_bn261108051.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261108051/quicklook/glg_lc_medres34_bn261108051.gif