TITLE:   GCN CIRCULAR
NUMBER:  43690
SUBJECT: GRB 260210C: Fermi GBM Final Real-time Localization
DATE:    26/02/10 20:00:13 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 19:49:42 UT on 10 Feb 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260210C (trigger 792445787.668744 / 260210826).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 338.7, Dec = 22.6 (J2000 degrees, equivalent to J2000 22h 34m, 22d 36'), with a statistical uncertainty of 7.5 degrees.

The angle from the Fermi LAT boresight is 26.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260210826/quicklook/glg_skymap_all_bn260210826.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/bn260210826/quicklook/glg_healpix_all_bn260210826.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260210826/quicklook/glg_lc_medres34_bn260210826.gif