TITLE: GCN CIRCULAR NUMBER: 40640 SUBJECT: GRB 250606A: Fermi GBM Final Real-time Localization DATE: 25/06/06 04:39:12 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 04:28:41 UT on 6 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250606A (trigger 770876926.822872 / 250606187).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 32.3, Dec = -78.2 (J2000 degrees, equivalent to J2000 02h 09m, -78d 12'), with a statistical uncertainty of 2.8 degrees.
The angle from the Fermi LAT boresight is 50.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250606187/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/bn250606187/q...
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250606187/q...
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