TITLE: GCN CIRCULAR NUMBER: 41510 SUBJECT: GRB 250823A: Fermi GBM Final Real-time Localization DATE: 25/08/23 20:20:56 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 20:10:10 UT on 23 Aug 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250823A (trigger 777672615.66839 / 250823840). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 315.5, Dec = -23.6 (J2000 degrees, equivalent to J2000 21h 02m, -23d 36'), with a statistical uncertainty of 8.7 degrees. The angle from the Fermi LAT boresight is 70.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250823840/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/bn250823840/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250823840/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/41510. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...