TITLE:   GCN CIRCULAR
NUMBER:  43310
SUBJECT: GRB 260102B: Fermi GBM Final Real-time Localization
DATE:    26/01/02 21:23:33 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 21:12:03 UT on 2 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260102B (trigger 789081128.373244 / 260102883).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 60.7, Dec = -67.8 (J2000 degrees, equivalent to J2000 04h 02m, -67d 47'), with a statistical uncertainty of 17.7 degrees.

The angle from the Fermi LAT boresight is 23.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260102883/quicklook/glg_skymap_all_bn260102883.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/bn260102883/quicklook/glg_healpix_all_bn260102883.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260102883/quicklook/glg_lc_medres34_bn260102883.gif