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/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