TITLE:   GCN CIRCULAR
NUMBER:  38784
SUBJECT: GRB 250102A: Fermi GBM Final Real-time Localization
DATE:    25/01/02 22:48:43 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 22:38:05 UT on 2 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250102A (trigger 757550290.223546 / 250102943).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 340.8, Dec = 42.3 (J2000 degrees, equivalent to J2000 22h 43m, 42d 17'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 2.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250102943/quicklook/glg_skymap_all_bn250102943.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/bn250102943/quicklook/glg_healpix_all_bn250102943.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250102943/quicklook/glg_lc_medres34_bn250102943.gif