TITLE: GCN CIRCULAR NUMBER: 40791 SUBJECT: GRB 250620A: Fermi GBM Final Real-time Localization DATE: 25/06/20 08:15:50 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 08:05:18 UT on 20 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250620A (trigger 772099523.9444 / 250620337).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 46.2, Dec = 65.8 (J2000 degrees, equivalent to J2000 03h 04m, 65d 47'), with a statistical uncertainty of 6.2 degrees.

The angle from the Fermi LAT boresight is 164.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250620337/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/bn250620337/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250620337/q...

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