TITLE: GCN CIRCULAR NUMBER: 41648 SUBJECT: GRB 250902A: Fermi GBM Final Real-time Localization DATE: 25/09/02 01:40:30 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 01:30:00 UT on 2 Sep 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250902A (trigger 778469405.491528 / 250902062). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 159.3, Dec = 16.3 (J2000 degrees, equivalent to J2000 10h 37m, 16d 18'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 78.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250902062/q... The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250902062/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250902062/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/41648. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...