TITLE: GCN CIRCULAR NUMBER: 31060 SUBJECT: GRB 211109B: Fermi GBM Final Real-time Localization DATE: 21/11/09 02:53:35 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 02:42:47 UT on 9 Nov 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211109B (trigger 658118572.33636 / 211109113). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 252.8, Dec = -45.1 (J2000 degrees, equivalent to J2000 16h 51m, -45d 06'), with a statistical uncertainty of 1.9 degrees. The angle from the Fermi LAT boresight is 13.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211109113/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/bn211109113/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211109113/q...