TITLE: GCN CIRCULAR NUMBER: 40675 SUBJECT: GRB 250610C: Fermi GBM Final Real-time Localization DATE: 25/06/10 23:21:44 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 23:11:04 UT on 10 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250610C (trigger 771289869.772446 / 250610966).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 26.8, Dec = 59.7 (J2000 degrees, equivalent to J2000 01h 47m, 59d 42'), with a statistical uncertainty of 2.5 degrees.
The angle from the Fermi LAT boresight is 64.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250610966/q...
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250610966/q...
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250610966/q...
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