TITLE:   GCN CIRCULAR
NUMBER:  26579
SUBJECT: GRB 191225A: Fermi GBM Final Real-time Localization
DATE:    19/12/25 07:35:21 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 07:25:16 UT on 25 Dec 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 191225A (trigger 598951521.49675 / 191225309).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 95.5, Dec = -17.4 (J2000 degrees, equivalent to J2000 06h 21m, -17d 23'), with a statistical uncertainty of 6.7 degrees.

The angle from the Fermi LAT boresight is 66.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191225309/quicklook/glg_skymap_all_bn191225309.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191225309/quicklook/glg_healpix_all_bn191225309.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191225309/quicklook/glg_lc_medres34_bn191225309.gif