TITLE: GCN CIRCULAR NUMBER: 41575 SUBJECT: GRB 250828A: Fermi GBM Final Localization DATE: 25/08/28 13:52:06 GMT FROM: A. Holzmann Airasca at University of Trento and INFN Bari <a.holzmannairasca@unitn.it> The Fermi GBM team reports the detection of a likely LONG GRB "At 12:00:02.52 UT on 28 August 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250828A (trigger 778075207/250828500). This trigger was initially classified as Unreliable location by the flight software, but is in fact a GRB. The on-ground calculated location, using the Fermi GBM trigger data, is RA = 220.44, Dec = -69.39 (J2000 degrees, equivalent to J2000 14h 41m, -69d 23m'), with a statistical uncertainty of 3.08 degrees. The angle from the Fermi LAT boresight is 14 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250828500/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/bn250828500/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250828500/q..." View this GCN Circular online at https://gcn.nasa.gov/circulars/41575. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...