TITLE: GCN CIRCULAR NUMBER: 31336 SUBJECT: GRB 211229B: Fermi GBM Final Real-time Localization DATE: 21/12/29 22:29:19 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 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/q...
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/q...
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211229930/q...