GCN 43370: GRB 260111A: Fermi GBM Final Real-time Localization

2026-01-11T16:43:36.432Z | rev 0 | event: GRB 260111A

The Fermi GBM team reports the detection of a likely LONG GRB

At 16:33:14 UT on 11 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260111A (trigger 789841999.012866 / 260111690).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 224.7, Dec = 50.4 (J2000 degrees, equivalent to J2000 14h 58m, 50d 23'), with a statistical uncertainty of 2.7 degrees.

The angle from the Fermi LAT boresight is 12.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260111690/quicklook/glg_skymap_all_bn260111690.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/bn260111690/quicklook/glg_healpix_all_bn260111690.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260111690/quicklook/glg_lc_medres34_bn260111690.gif