GRB 260208A: Long gamma-ray burst at z=2.36 with multi-wavelength detections

AI Summary

Fermi GBM detected a long gamma-ray burst (GRB 260208A, trigger 792220053) on 2026-02-08 at 05:07:28 UT with a duration of ~35-38 seconds and peak flux of 29.7 ph/s/cm². The burst was confirmed by multiple gamma-ray instruments (Fermi-LAT, GECAM-B, NuSTAR, Glowbug, TERI) and localized to RA=204.73°, Dec=33.80° with a redshift of z=2.36. Extensive multi-wavelength follow-up detected the optical counterpart (AT 2026ciw) with initial magnitude ~15.2 and subsequent fading to r'~20.9, plus radio detection by the VLA at 6-15 GHz with flux densities of 59-125 µJy/beam.