TITLE:   GCN CIRCULAR
NUMBER:  31280
SUBJECT: GRB 211222A: Fermi GBM Final Real-time Localization
DATE:    21/12/22 18:36:35 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 SHORT GRB

At 18:26:12 UT on 22 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211222A (trigger 661890377.228366 / 211222768).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 103.4, Dec = -53.8 (J2000 degrees, equivalent to J2000 06h 53m, -53d 47'), with a statistical uncertainty of 20.6 degrees.

The angle from the Fermi LAT boresight is 64.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211222768/quicklook/glg_skymap_all_bn211222768.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/bn211222768/quicklook/glg_healpix_all_bn211222768.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211222768/quicklook/glg_lc_medres34_bn211222768.gif