TITLE:   GCN CIRCULAR
NUMBER:  43467
SUBJECT: GRB 260120A: Fermi GBM Final Real-time Localization
DATE:    26/01/20 04:12:25 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 04:01:54 UT on 20 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260120A (trigger 790574519.95612 / 260120168).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 345.9, Dec = -24.7 (J2000 degrees, equivalent to J2000 23h 03m, -24d 41'), with a statistical uncertainty of 2.5 degrees.

The angle from the Fermi LAT boresight is 72.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260120168/quicklook/glg_skymap_all_bn260120168.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/bn260120168/quicklook/glg_healpix_all_bn260120168.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260120168/quicklook/glg_lc_medres34_bn260120168.gif