TITLE: GCN CIRCULAR NUMBER: 43920 SUBJECT: GRB 260305A: Fermi GBM Final Real-time Localization DATE: 26/03/05 02:52:09 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 02:41:38 UT on 5 Mar 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260305A (trigger 794371303.18619 / 260305112). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 216.5, Dec = 34.0 (J2000 degrees, equivalent to J2000 14h 26m, 34d 00'), with a statistical uncertainty of 2.4 degrees. The angle from the Fermi LAT boresight is 49.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260305112/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/bn260305112/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260305112/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/43920. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...