TITLE:   GCN CIRCULAR
NUMBER:  31207
SUBJECT: GRB 211211B: Fermi GBM Final Real-time Localization
DATE:    21/12/11 21:58:52 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 21:48:42 UT on 11 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211211B (trigger 660952127.842124 / 211211909).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 228.1, Dec = 48.4 (J2000 degrees, equivalent to J2000 15h 12m, 48d 23'), with a statistical uncertainty of 7.3 degrees.

The angle from the Fermi LAT boresight is 128.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211211909/quicklook/glg_skymap_all_bn211211909.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/bn211211909/quicklook/glg_healpix_all_bn211211909.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211211909/quicklook/glg_lc_medres34_bn211211909.gif