TITLE: GCN CIRCULAR NUMBER: 30821 SUBJECT: GRB 210912B: Fermi GBM Final Real-time Localization DATE: 21/09/12 12:38:51 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 12:31:34 UT on 12 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210912B (trigger 653142699.29167 / 210912522). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 344.9, Dec = 24.6 (J2000 degrees, equivalent to J2000 22h 59m, 24d 36'), with a statistical uncertainty of 12.3 degrees. The angle from the Fermi LAT boresight is 103.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210912522/q... The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210912522/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210912522/q...