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GCN Circular 31306

Subject
GRB 211225C: Fermi GBM Final Real-time Localization
Date
2021-12-25T18:24:37Z (2 years ago)
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 18:14:04 UT on 25 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211225C (trigger 662148849.44199 / 211225760).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 339.9, Dec = -59.0 (J2000 degrees, equivalent to J2000 22h 39m, -59d 00'), with a statistical uncertainty of 36.0 degrees.

The angle from the Fermi LAT boresight is 151.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211225760/quicklook/glg_skymap_all_bn211225760.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/bn211225760/quicklook/glg_healpix_all_bn211225760.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211225760/quicklook/glg_lc_medres34_bn211225760.gif
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