General information
GRB 260825A is reported as a likely long gamma-ray burst first detected and localized by Fermi/GBM at 2026-08-25 13:07:15 UT, with a GBM position of RA = 88.3 deg, Dec = -1.2 deg and statistical uncertainty of 5.7 deg. It was subsequently reported in gamma rays by AstroSat/CZTI, GECAM-B, and SVOM/GRM.
Wavelength coverage
- Gamma-ray: Fermi/GBM detected and localized the burst; AstroSat/CZTI detected it in the 100-500 keV Veto detector; GECAM-B reported emission in about 70-6000 keV; SVOM/GRM reported emission in 15-5000 keV and a 10-1000 keV fluence.
No optical, X-ray, radio, neutrino, or gravitational-wave observations are mentioned.
Lightcurve and spectrum
- Fermi/GBM triggered at 13:07:15 UT on 25 Aug 2026 and reported a likely long GRB.
- AstroSat/CZTI measured a light-curve peak at 2026-08-25 13:07:14.95 UTC, a peak count rate of 161 (+58, -1) counts/s above background, total counts of 7311 (+1106, -1122), and a local mean background rate of 660 (+2, -2) counts/s.
- AstroSat/CZTI measured T90 = 206 (+23, -17) s from the cumulative Veto light curve, noting that the long duration is due to a small flare at 13:09:11.95 UTC; if that flare is unrelated, the primary has T90 = 63 (+6, -26) s.
- GECAM-B reported multiple pulses with T90 = 45 +7/-13 s in about 70-6000 keV.
- SVOM/GRM reported multiple pulses with T90 = 47 +8/-5 s in the 15-5000 keV band.
- SVOM/GRM found the time-averaged spectrum from T0-9 to T0+38 s is best fit by a power law with index -1.06 +0.6/-0.06.
- SVOM/GRM measured a 10-1000 keV fluence of (1.26 +/- 0.07)E-05 erg/cm^2 over T0-9 to T0+38 s.
Redshift
What’s special vs typical
Multiple gamma-ray spacecraft reported the event, giving robust prompt-emission confirmation and several independent duration measurements, but the provided circulars do not report an afterglow, host, redshift, or multi-messenger association.