TITLE:   GCN CIRCULAR
NUMBER:  43629
SUBJECT: GRB 260207B: Fermi GBM Final Real-time Localization
DATE:    26/02/07 13:22:56 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 13:12:10 UT on 7 Feb 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260207B (trigger 792162735.829288 / 260207550).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 292.9, Dec = 50.0 (J2000 degrees, equivalent to J2000 19h 31m, 50d 00'), with a statistical uncertainty of 2.8 degrees.

The angle from the Fermi LAT boresight is 45.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207550/quicklook/glg_skymap_all_bn260207550.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/bn260207550/quicklook/glg_healpix_all_bn260207550.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207550/quicklook/glg_lc_medres34_bn260207550.gif