TITLE: GCN CIRCULAR NUMBER: 42124 SUBJECT: GRB 251006A: Fermi GBM Final Real-time Localization DATE: 25/10/06 13:38:08 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 13:27:35 UT on 6 Oct 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251006A (trigger 781450060.028394 / 251006561).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 269.1, Dec = -16.6 (J2000 degrees, equivalent to J2000 17h 56m, -16d 36'), with a statistical uncertainty of 12.0 degrees.

The angle from the Fermi LAT boresight is 30.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251006561/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/bn251006561/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251006561/q...

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