TITLE: GCN CIRCULAR NUMBER: 43795 SUBJECT: GRB 260221A: Fermi GBM Final Real-time Localization DATE: 26/02/21 16:33:30 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 16:22:52 UT on 21 Feb 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260221A (trigger 793383777.240036 / 260221683). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 213.3, Dec = 51.9 (J2000 degrees, equivalent to J2000 14h 13m, 51d 53'), with a statistical uncertainty of 6.6 degrees. The angle from the Fermi LAT boresight is 128.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260221683/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/bn260221683/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260221683/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/43795. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...