TITLE: GCN CIRCULAR NUMBER: 42111 SUBJECT: GRB 251005A: Fermi GBM Final Localization DATE: 25/10/05 09:53:14 GMT FROM: Utkarsh Pathak at IIT Bombay utkarshpathak.07@gmail.com

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

"At 05:27:08.25 UT on 05 October 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251005A (trigger 781334833/251005227).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 227.84, Dec = 5.07 (J2000 degrees, equivalent to J2000 15h 11m, 5d 04'), with a statistical uncertainty of 4.90 degrees.

The angle from the Fermi LAT boresight is 86 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251005227/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/bn251005227/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251005227/q..."

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