TITLE: GCN CIRCULAR NUMBER: 42719 SUBJECT: GRB 251117A: Fermi GBM Final Localization Correction DATE: 25/11/17 13:55:50 GMT FROM: Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it> The Fermi GBM team reports the detection of a likely SHORT GRB. At 12:19:52.14 UT on 17 November 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251117A (trigger 785074797/251117514). This trigger was initially classified as Below horizon by the flight software, but is in fact due to a GRB. The on-ground calculated location, using the Fermi GBM trigger data, is RA = 335.05, Dec = 5.01 (J2000 degrees, equivalent to J2000 22h 20m, +05d 00'), with a statistical uncertainty of 4.40 degrees. The angle from the Fermi LAT boresight is 52 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251117514/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/bn251117514/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251117514/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/42719. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...