TITLE: GCN CIRCULAR NUMBER: 45453 SUBJECT: GRB 260827A: Fermi GBM Final Real-time Localization DATE: 26/08/27 10:54:27 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 10:42:59 UT on 27 Aug 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260827A (trigger 809520184.770226 / 260827447). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 247.9, Dec = -53.5 (J2000 degrees, equivalent to J2000 16h 31m, -53d 30'), with a statistical uncertainty of 2.4 degrees. The angle from the Fermi LAT boresight is 41.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260827447/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/bn260827447/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260827447/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/45453. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...