GCN Circular 45550
Subject
GRB 260910B: Fermi GBM Final Real-time Localization
Event
Date
2026-09-10T23:27:13Z (5 days 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 23:16:44 UT on 10 Sep 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260910B (trigger 810775009.56521 / 260910970).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 260.8, Dec = -0.7 (J2000 degrees, equivalent to J2000 17h 23m, 0d 42'), with a statistical uncertainty of 6.2 degrees.
The angle from the Fermi LAT boresight is 94.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260910970/quicklook/glg_skymap_all_bn260910970.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/bn260910970/quicklook/glg_healpix_all_bn260910970.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260910970/quicklook/glg_lc_medres34_bn260910970.gif