TITLE:   GCN CIRCULAR
NUMBER:  43688
SUBJECT: GRB 260210B: Fermi GBM Final Real-time Localization
DATE:    26/02/10 18:24:59 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 18:14:06 UT on 10 Feb 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260210B (trigger 792440051.126154 / 260210760).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 6.0, Dec = -48.3 (J2000 degrees, equivalent to J2000 00h 24m, -48d 17'), with a statistical uncertainty of 10.3 degrees.

The angle from the Fermi LAT boresight is 22.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260210760/quicklook/glg_skymap_all_bn260210760.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/bn260210760/quicklook/glg_healpix_all_bn260210760.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260210760/quicklook/glg_lc_medres34_bn260210760.gif