GCN Circular 31343
Subject
GRB 211231A: Fermi GBM Final Real-time Localization
Date
2021-12-31T07:11:46Z (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 07:00:31 UT on 31 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211231A (trigger 662626836.787242 / 211231292).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 292.2, Dec = -24.9 (J2000 degrees, equivalent to J2000 19h 28m, -24d 53'), with a statistical uncertainty of 1.8 degrees.
The angle from the Fermi LAT boresight is 62.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211231292/quicklook/glg_skymap_all_bn211231292.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/bn211231292/quicklook/glg_healpix_all_bn211231292.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211231292/quicklook/glg_lc_medres34_bn211231292.gif