TITLE: GCN CIRCULAR NUMBER: 45473 SUBJECT: GRB 260831A: Fermi GBM Final Real-time Localization DATE: 26/08/31 04:17:21 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 04:09:00 UT on 31 Aug 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260831A (trigger 809842145.925584 / 260831173). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 220.0, Dec = -7.2 (J2000 degrees, equivalent to J2000 14h 39m, -7d 12'), with a statistical uncertainty of 6.5 degrees. The angle from the Fermi LAT boresight is 84.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260831173/q... The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260831173/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260831173/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/45473. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...