General information
GRB 260518A is a long-duration gamma-ray burst detected by AstroSat-CZTI and independently by Konus-Wind, with trigger/peak times around 2026-05-18 07:44:29–07:44:34 UTC.
Wavelength coverage
- Gamma-rays / hard X-rays: Detected by AstroSat-CZTI (20–200 keV) and CZTI CsI Veto (100–500 keV), and by Konus-Wind (20 keV–10 MeV; emission up to ~1 MeV).
No observations are mentioned in radio, optical/NIR, UV, soft X-rays, or TeV.
Lightcurve and spectrum
- AstroSat-CZTI: light-curve peak at 07:44:29.50 UTC; T90 = 9 ± 2 s (20–200 keV); peak count rate 380 (+84, -78) counts/s above background.
- AstroSat-CZTI Veto: peak at 07:44:29.10 UTC; T90 = 10 (+2, -3) s (100–500 keV); peak count rate 417 (+67, -72) counts/s above background.
- Konus-Wind: multipeaked structure starting ~T0-9 s; total duration ~18 s; total fluence 4.59(-0.38,+0.42)×10^-6 erg/cm^2 and 64-ms peak flux 2.35(-0.47,+0.48)×10^-6 erg/cm^2/s (20 keV–10 MeV).
- Konus-Wind spectrum (T0 to T0+8.448 s): cutoff power-law with alpha = -0.11(-0.36,+0.42) and Ep = 213(-24,+31) keV; Band-model fit gives beta < -2.9.
Redshift
What’s special vs typical