TITLE:   GCN CIRCULAR
NUMBER:  43653
SUBJECT: GRB 260208D: Fermi GBM Final Real-time Localization
DATE:    26/02/08 21:53:17 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 21:42:45 UT on 8 Feb 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260208D (trigger 792279770.48211 / 260208905).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 327.7, Dec = -39.0 (J2000 degrees, equivalent to J2000 21h 50m, -39d 00'), with a statistical uncertainty of 6.9 degrees.

The angle from the Fermi LAT boresight is 51.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260208905/quicklook/glg_skymap_all_bn260208905.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/bn260208905/quicklook/glg_healpix_all_bn260208905.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260208905/quicklook/glg_lc_medres34_bn260208905.gif