TITLE: GCN CIRCULAR NUMBER: 42790 SUBJECT: GRB 251121A: Fermi GBM Final Real-time Localization DATE: 25/11/21 16:41:36 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 SHORT GRB At 16:30:58 UT on 21 Nov 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251121A (trigger 785435463.990588 / 251121688). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 250.6, Dec = -19.8 (J2000 degrees, equivalent to J2000 16h 42m, -19d 48'), with a statistical uncertainty of 19.5 degrees. The angle from the Fermi LAT boresight is 100.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251121688/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/bn251121688/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251121688/q... View this GCN Circular online at https://gcn.nasa.gov/circulars/42790. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...