TITLE:   GCN CIRCULAR
NUMBER:  39467
SUBJECT: GRB 250225A: Fermi GBM Final Real-time Localization
DATE:    25/02/25 06:35:59 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 06:25:23 UT on 25 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250225A (trigger 762157528.045892 / 250225268).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 60.0, Dec = -40.5 (J2000 degrees, equivalent to J2000 04h 00m, -40d 30'), with a statistical uncertainty of 12.1 degrees.

The angle from the Fermi LAT boresight is 72.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250225268/quicklook/glg_skymap_all_bn250225268.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/bn250225268/quicklook/glg_healpix_all_bn250225268.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250225268/quicklook/glg_lc_medres34_bn250225268.gif