TITLE: GCN CIRCULAR NUMBER: 43656 SUBJECT: GRB 260209A: Fermi GBM Final Real-time Localization DATE: 26/02/09 02:56:37 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 02:45:57 UT on 9 Feb 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260209A (trigger 792297962.23625 / 260209115). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 75.8, Dec = 33.0 (J2000 degrees, equivalent to J2000 05h 03m, 33d 00'), with a statistical uncertainty of 9.2 degrees. The angle from the Fermi LAT boresight is 87.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260209115/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/bn260209115/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260209115/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/43656. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...