TITLE: GCN CIRCULAR NUMBER: 30843 SUBJECT: GRB 210917A: Fermi GBM Final Real-time Localization DATE: 21/09/17 03:56:05 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 03:45:47 UT on 17 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210917A (trigger 653543152.223672 / 210917157). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 75.5, Dec = -36.2 (J2000 degrees, equivalent to J2000 05h 01m, -36d 12'), with a statistical uncertainty of 5.6 degrees. The angle from the Fermi LAT boresight is 90.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210917157/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/bn210917157/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210917157/q...