TITLE:   GCN CIRCULAR
NUMBER:  26581
SUBJECT: GRB 191225B: Fermi GBM Final Real-time Localization
DATE:    19/12/25 17:47:56 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 17:37:51 UT on 25 Dec 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 191225B (trigger 598988276.867438 / 191225735).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 145.8, Dec = -7.2 (J2000 degrees, equivalent to J2000 09h 43m, -7d 12'), with a statistical uncertainty of 2.8 degrees.

The angle from the Fermi LAT boresight is 61.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191225735/quicklook/glg_skymap_all_bn191225735.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/bn191225735/quicklook/glg_healpix_all_bn191225735.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191225735/quicklook/glg_lc_medres34_bn191225735.gif