TITLE:   GCN CIRCULAR
NUMBER:  40668
SUBJECT: GRB 250610A: Fermi GBM Final Real-time Localization
DATE:    25/06/10 13:58:44 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 13:48:25 UT on 10 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250610A (trigger 771256110.581806 / 250610575).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 359.9, Dec = 65.1 (J2000 degrees, equivalent to J2000 23h 59m, 65d 05'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 0.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250610575/quicklook/glg_skymap_all_bn250610575.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/bn250610575/quicklook/glg_healpix_all_bn250610575.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250610575/quicklook/glg_lc_medres34_bn250610575.gif