TITLE: GCN CIRCULAR NUMBER: 30958 SUBJECT: GRB 211023A: Fermi GBM Final Real-time Localization DATE: 21/10/23 13:16:10 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 13:05:43 UT on 23 Oct 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211023A (trigger 656687148.17411 / 211023546). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 78.8, Dec = 82.3 (J2000 degrees, equivalent to J2000 05h 15m, 82d 17'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 56.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211023546/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/bn211023546/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211023546/q...