GCN Circular 31287
Subject
GRB 211223B: Fermi GBM Final Real-time Localization
Date
2021-12-23T08:33:43Z (3 years ago)
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 08:23:22 UT on 23 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211223B (trigger 661940607.257526 / 211223350).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 287.6, Dec = 42.2 (J2000 degrees, equivalent to J2000 19h 10m, 42d 12'), with a statistical uncertainty of 8.1 degrees.
The angle from the Fermi LAT boresight is 13.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211223350/quicklook/glg_skymap_all_bn211223350.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/bn211223350/quicklook/glg_healpix_all_bn211223350.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211223350/quicklook/glg_lc_medres34_bn211223350.gif