TITLE:   GCN CIRCULAR
NUMBER:  32812
SUBJECT: GRB 221021A: Fermi GBM Final Real-time Localization
DATE:    22/10/21 09:28:45 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 09:18:25 UT on 21 Oct 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221021A (trigger 688036710.740176 / 221021388).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 218.7, Dec = -68.6 (J2000 degrees, equivalent to J2000 14h 34m, -68d 35'), with a statistical uncertainty of 11.9 degrees.

The angle from the Fermi LAT boresight is 132.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221021388/quicklook/glg_skymap_all_bn221021388.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221021388/quicklook/glg_healpix_all_bn221021388.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221021388/quicklook/glg_lc_medres34_bn221021388.gif