TITLE:   GCN CIRCULAR
NUMBER:  29394
SUBJECT: GRB 210204B: Fermi GBM Final Real-time Localization
DATE:    21/02/04 18:49:19 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 18:38:59 UT on 4 Feb 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210204B (trigger 634156744.570034 / 210204777).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 272.5, Dec = -54.8 (J2000 degrees, equivalent to J2000 18h 10m, -54d 47'), with a statistical uncertainty of 2.4 degrees.

The angle from the Fermi LAT boresight is 40.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210204777/quicklook/glg_skymap_all_bn210204777.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/bn210204777/quicklook/glg_healpix_all_bn210204777.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210204777/quicklook/glg_lc_medres34_bn210204777.gif