TITLE: GCN CIRCULAR NUMBER: 30786 SUBJECT: GRB 210909A: Fermi GBM Final Real-time Localization DATE: 21/09/09 10:53:27 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 10:43:19 UT on 9 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210909A (trigger 652877004.365114 / 210909447). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 140.6, Dec = 83.3 (J2000 degrees, equivalent to J2000 09h 22m, 83d 17'), with a statistical uncertainty of 2.7 degrees. The angle from the Fermi LAT boresight is 88.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210909447/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/bn210909447/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210909447/q...