TITLE: GCN CIRCULAR NUMBER: 31025 SUBJECT: GRB 211031A: Fermi GBM Final Real-time Localization DATE: 21/10/31 04:21:52 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 04:11:39 UT on 31 Oct 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211031A (trigger 657346304.154694 / 211031175).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 72.0, Dec = -54.3 (J2000 degrees, equivalent to J2000 04h 47m, -54d 17'), with a statistical uncertainty of 10.7 degrees.
The angle from the Fermi LAT boresight is 28.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211031175/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/bn211031175/q...
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211031175/q...