TITLE: GCN CIRCULAR NUMBER: 40648 SUBJECT: GRB 250607A: Fermi GBM Final Localization DATE: 25/06/07 15:22:38 GMT FROM: rhamburg@usra.edu

The Fermi GBM team reports the detection of a likely LONG GRB.

"At 14:00:55.64 UT on 07 June 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250607A (trigger 770997660/250607584).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 243.84, Dec = -24.71 (J2000 degrees, equivalent to J2000 16h 15m, -24d 42'), with a statistical uncertainty of 10.15 degrees.

The angle from the Fermi LAT boresight is 90 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250607584/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/bn250607584/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250607584/q..."

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