TITLE: GCN CIRCULAR NUMBER: 43104 SUBJECT: GRB 251215A: Fermi GBM Final Real-time Localization DATE: 25/12/15 04:31:53 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 04:21:21 UT on 15 Dec 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251215A (trigger 787465286.567966 / 251215181). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 112.8, Dec = -43.7 (J2000 degrees, equivalent to J2000 07h 31m, -43d 42'), with a statistical uncertainty of 7.6 degrees. The angle from the Fermi LAT boresight is 31.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251215181/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/bn251215181/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251215181/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/43104. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...