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/quicklook/glg_skymap_all_bn251005227.png

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/quicklook/glg_healpix_all_bn251005227.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251005227/quicklook/glg_lc_medres34_bn251005227.gif"