TITLE:   GCN CIRCULAR
NUMBER:  33096
SUBJECT: GRB 221223A: Fermi GBM Final Real-time Localization
DATE:    22/12/24 00:06:24 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 23:56:06 UT on 23 Dec 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221223A (trigger 693532571.759198 / 221223997).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 353.6, Dec = -11.8 (J2000 degrees, equivalent to J2000 23h 34m, -11d 48'), with a statistical uncertainty of 8.2 degrees.

The angle from the Fermi LAT boresight is 82.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221223997/quicklook/glg_skymap_all_bn221223997.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221223997/quicklook/glg_healpix_all_bn221223997.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221223997/quicklook/glg_lc_medres34_bn221223997.gif