TITLE: GCN CIRCULAR NUMBER: 42131 SUBJECT: GRB 251006B: Fermi GBM Final Real-time Localization DATE: 25/10/06 20:15:37 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 20:05:04 UT on 6 Oct 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251006B (trigger 781473909.040226 / 251006837). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 40.5, Dec = -4.0 (J2000 degrees, equivalent to J2000 02h 42m, -4d 00'), with a statistical uncertainty of 1.2 degrees. The angle from the Fermi LAT boresight is 105.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251006837/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/bn251006837/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251006837/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/42131. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...