GRB 260506B

General information

GRB 260506B triggered Fermi/GBM at 13:07:23 UT on 2026-05-06 and is described as a likely LONG GRB, with subsequent gamma-ray confirmations by AstroSat/CZTI and the Glowbug telescope.

Wavelength coverage

• Gamma-ray / hard X-ray: Detected by Fermi/GBM; AstroSat/CZTI (20–200 keV) and CZTI Veto (100–500 keV); Glowbug detection with reported ~34 sigma significance. No observations were mentioned in soft X-ray, ultraviolet, optical, infrared, radio, gravitational waves, or neutrinos.

Lightcurve and spectrum

AstroSat/CZTI reports multiple peaks with the strongest peak at 2026-05-06 13:07:41.9 UTC, peak count rate 129 (+37, -17) counts/s above background (total 899 (+239, -328) counts) in 20–200 keV, with T90 = 22 (+12, -15) s (noting 0.3 s deadtime). AstroSat/CZTI Veto (100–500 keV) shows multiple peaks with strongest peak at 13:07:42.0 UTC, peak count rate 440 (+67, -69) counts/s above background (total 3325 (+520, -551) counts), and T90 = 36 (+3, -7) s. Glowbug reports onset at 13:07:30.824 with duration 20.5 s and a lightcurve featuring a faint initial peak (T0+1 s), complex structure (T0+7 to +15 s), and a peak at ~T0+21 s, with deadtime affecting ~T0-1 to +1 s.

Redshift

What’s special vs typical