GCN Circular 45789
Subject
GRB 260930B: Fermi GBM Final Real-time Localization
Event
Date
2026-09-30T22:53:04Z (a day ago)
From
Eva MP at INAOE <eva.palafox@gmail.com>
Via
Web form
The Fermi GBM team reports the detection of a likely SHORT GRB
At 18:57:03 UT on 30 Sep 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260930B (trigger 812487422.769082 / 260930790).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 104.2, Dec = 44.2 (J2000 degrees, equivalent to J2000 06h 56m, 44d 12'), with a statistical uncertainty of 6.2 degrees.
The angle from the Fermi LAT boresight is 150.0 degrees.
The skymap can be found here:https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260930790/quicklook/glg_skymap_all_bn260930790.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/bn260930790/quicklook/glg_healpix_all_bn260930790.fit
The GBM light curve can be found here:https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260930790/quicklook/glg_lc_medres34_bn260930790.gif