TITLE:   GCN CIRCULAR
NUMBER:  40845
SUBJECT: GRB 250626A: Fermi GBM Final Real-time Localization
DATE:    25/06/26 22:24:29 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 SHORT GRB

At 22:13:53 UT on 26 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250626A (trigger 772668838.960546 / 250626926).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 35.5, Dec = -6.6 (J2000 degrees, equivalent to J2000 02h 22m, -6d 35'), with a statistical uncertainty of 19.9 degrees.

The angle from the Fermi LAT boresight is 58.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250626926/quicklook/glg_skymap_all_bn250626926.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/bn250626926/quicklook/glg_healpix_all_bn250626926.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250626926/quicklook/glg_lc_medres34_bn250626926.gif