TITLE:   GCN CIRCULAR
NUMBER:  46022
SUBJECT: GRB 261024B: Fermi GBM Final Real-time Localization
DATE:    26/10/24 22:38:08 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 LONG GRB

At 22:27:33 UT on 24 Oct 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 261024B (trigger 814573658.65781 / 261024936).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 187.3, Dec = 32.4 (J2000 degrees, equivalent to J2000 12h 29m, 32d 23'), with a statistical uncertainty of 19.3 degrees.

The angle from the Fermi LAT boresight is 41.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261024936/quicklook/glg_skymap_all_bn261024936.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261024936/quicklook/glg_healpix_all_bn261024936.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261024936/quicklook/glg_lc_medres34_bn261024936.gif