General information
GRB 260810A is a long gamma-ray burst detected in prompt high-energy emission by AstroSat CZTI, Glowbug, Insight-HXMT/HE, and SVOM/GRM. SVOM/GRM reports a localization at RA = 234.55 deg, Dec = 2.02 deg with 1.64 deg statistical 90% confidence error radius.
Wavelength coverage
- Gamma-ray / hard X-ray: AstroSat CZTI detected 20-200 keV emission and CsI Veto detected 100-500 keV emission; Glowbug detected the burst with about 178 sigma significance; Insight-HXMT/HE detected it in about 60-900 keV deposited energy; SVOM/GRM observed it in 15-5000 keV and reports spectral parameters, fluence, and peak flux.
- Soft X-ray / coded mask: SVOM/ECLAIRs detected burst emission through reflection onto the Earth atmosphere, while the source position was outside the ECLAIRs field of view.
No optical, infrared, radio, neutrino, or gravitational-wave observations are mentioned.
Lightcurve and spectrum
- AstroSat CZTI: multiple peaks, strongest CZT peak at 2026-08-10 19:09:52.63 UTC, T90 = 13 (+1, -2) s, peak count rate 762 (+50, -55) counts/s above background, total 3869 (+166, -185) counts.
- AstroSat Veto: multiple peaks, strongest peak at 2026-08-10 19:09:44.03 UTC, T90 = 12 (+1, -1) s, peak count rate 1664 (+74, -88) counts/s above background, total 7362 (+234, -330) counts.
- Glowbug: onset 2026-08-10 19:09:41.760 UTC, duration 19.5 s, multi-peaked structure with maxima at about T0+1 s and T0+9.5 s, total significance about 178 sigma.
- Insight-HXMT/HE: T0 = 2026-08-10T19:09:43.350, light curve mainly consists of two pulses, T90 = 18.0 +7.0/-5.5 s, 1 s peak rate 4028 counts/s from T0+0.25 s, total 15728 counts.
- SVOM/GRM: T0 = 2026-08-10T19:09:43.050, T90 = 18.0 +5.5/-2.5 s in 15-5000 keV.
- SVOM/GRM time-averaged spectrum from T0-0.55 to T0+20.95 s: cutoff power law with index -1.60 +/- 0.03, Epeak = 974 +281/-193 keV, fluence (10-1000 keV) = (4.84 +0.07/-0.06)E-05 erg/cm^2.
- SVOM/GRM 1 s peak spectrum from T0+0.45 to T0+1.45 s: cutoff power law with index -1.04 +0.08/-0.07, Epeak = 835 +152/-115 keV, flux (10-1000 keV) = (9.99 +0.21/-0.22)E-06 erg/cm^2/s.
Redshift
What’s special vs typical
The burst is notable within the provided reports for being independently detected by four gamma-ray instruments and for having a very high Glowbug significance of about 178 sigma, plus detailed SVOM/GRM prompt spectral measurements.