TITLE: GCN CIRCULAR NUMBER: 31032 SUBJECT: GRB 211102B: Fermi GBM Final Real-time Localization DATE: 21/11/02 14:16:38 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 14:05:35 UT on 2 Nov 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211102B (trigger 657554740.140466 / 211102587).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 300.9, Dec = -2.6 (J2000 degrees, equivalent to J2000 20h 03m, -2d 36'), with a statistical uncertainty of 1.8 degrees.

The angle from the Fermi LAT boresight is 64.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211102587/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/bn211102587/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211102587/q...