GCN Circular 31336
Subject
GRB 211229B: Fermi GBM Final Real-time Localization
Date
2021-12-29T22:29:19Z (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 22:18:43 UT on 29 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211229B (trigger 662509128.09648 / 211229930).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 185.0, Dec = -18.4 (J2000 degrees, equivalent to J2000 12h 20m, -18d 23'), with a statistical uncertainty of 1.1 degrees.
The angle from the Fermi LAT boresight is 59.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211229930/quicklook/glg_skymap_all_bn211229930.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/bn211229930/quicklook/glg_healpix_all_bn211229930.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211229930/quicklook/glg_lc_medres34_bn211229930.gif