TITLE:   GCN CIRCULAR
NUMBER:  44878
SUBJECT: GRB 260608C: Fermi GBM Final Real-time Localization
DATE:    26/06/09 00:06:51 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 23:54:23 UT on 8 Jun 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260608C (trigger 802655668.086186 / 260608996).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 245.4, Dec = 47.8 (J2000 degrees, equivalent to J2000 16h 21m, 47d 47'), with a statistical uncertainty of 9.6 degrees.

The angle from the Fermi LAT boresight is 122.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/quicklook/glg_skymap_all_bn260608996.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/bn260608996/quicklook/glg_healpix_all_bn260608996.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/quicklook/glg_lc_medres34_bn260608996.gif