TITLE: GCN CIRCULAR NUMBER: 44340 SUBJECT: GRB 260418B: Fermi GBM Final Real-time Localization DATE: 26/04/18 16:30:58 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 16:20:21 UT on 18 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260418B (trigger 798222026.725586 / 260418681). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 34.7, Dec = -40.5 (J2000 degrees, equivalent to J2000 02h 18m, -40d 30'), with a statistical uncertainty of 4.0 degrees. The angle from the Fermi LAT boresight is 47.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260418681/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/bn260418681/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260418681/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/44340. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...