TITLE:   GCN CIRCULAR
NUMBER:  39141
SUBJECT: GRB 250204B: Fermi GBM Final Localization
DATE:    25/02/04 14:58:59 GMT
FROM:    Marianna Dafčíková at Masaryk University <500025@mail.muni.cz>

The Fermi GBM team reports the detection of a likely LONG GRB

At 06:41:14.00 UT on 04 February 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250204B (trigger 760344078/250204279).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 2.35, Dec = 29.70 (J2000 degrees, equivalent to J2000 0h 9m, +29d 41'),
with a statistical uncertainty of 2.80 degrees.

The angle from the Fermi LAT boresight is 124 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250204279/quicklook/glg_skymap_all_bn250204279.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250204279/quicklook/glg_healpix_all_bn250204279.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250204279/quicklook/glg_lc_medres34_bn250204279.gif