TITLE:   GCN CIRCULAR
NUMBER:  43482
SUBJECT: GRB 260120C: Fermi GBM Final Real-time Localization
DATE:    26/01/20 23:15:26 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 23:07:06 UT on 20 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260120C (trigger 790643231.34709 / 260120963).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 262.0, Dec = 3.4 (J2000 degrees, equivalent to J2000 17h 27m, 3d 23'), with a statistical uncertainty of 9.3 degrees.

The angle from the Fermi LAT boresight is 108.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260120963/quicklook/glg_skymap_all_bn260120963.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/bn260120963/quicklook/glg_healpix_all_bn260120963.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260120963/quicklook/glg_lc_medres34_bn260120963.gif