TITLE: GCN CIRCULAR NUMBER: 41565 SUBJECT: GRB 250827A: Fermi GBM Final Real-time Localization DATE: 25/08/27 15:45:24 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 15:34:53 UT on 27 Aug 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250827A (trigger 778001698.2092 / 250827649). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 346.8, Dec = -43.8 (J2000 degrees, equivalent to J2000 23h 07m, -43d 47'), with a statistical uncertainty of 7.2 degrees. The angle from the Fermi LAT boresight is 90.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250827649/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/bn250827649/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250827649/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/41565. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...