TITLE:   GCN CIRCULAR
NUMBER:  30958
SUBJECT: GRB 211023A: Fermi GBM Final Real-time Localization
DATE:    21/10/23 13:16:10 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 13:05:43 UT on 23 Oct 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211023A (trigger 656687148.17411 / 211023546).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 78.8, Dec = 82.3 (J2000 degrees, equivalent to J2000 05h 15m, 82d 17'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 56.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211023546/quicklook/glg_skymap_all_bn211023546.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211023546/quicklook/glg_healpix_all_bn211023546.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211023546/quicklook/glg_lc_medres34_bn211023546.gif