General information
GRB 260430B is reported as a long gamma-ray burst detected by AstroSat/CZTI and by the Glowbug gamma-ray telescope on the ISS, with SVOM/GRM also mentioned as having detected it.
Wavelength coverage
- Gamma-rays / hard X-rays: AstroSat/CZTI detection in 20–200 keV and CsI Veto detection in 100–500 keV; Glowbug gamma-ray detection with reported onset, duration, and significance.
No observations are mentioned at optical/UV, soft X-ray (non-gamma), radio, IR, neutrinos, or gravitational waves.
Lightcurve and spectrum
- AstroSat/CZTI (20–200 keV): light-curve peak at 2026-04-30 16:04:26.34 UTC; peak count rate 100 (+32, -10) counts/s above background; total counts 1436 (+290, -227); background 219 (+1, -2) counts/s; T90 = 47 (+2, -4) s.
- AstroSat/CZTI Veto (100–500 keV): peak at 2026-04-30 16:04:22.5 UTC; peak count rate 417 (+77, -26) counts/s above background; total counts 6007 (+912, -928); background 1271 (+6, -6) counts/s; T90 = 40 (+11, -6) s.
- Glowbug: onset 2026-04-30 16:04:22.184 UTC; duration 49.2 s; total significance ~113 sigma; complex series of peaks throughout the burst.
Redshift
What’s special vs typical