General information
GRB 260219A is a likely long GRB triggered by Fermi/GBM at 2026-02-19 14:04:53 UT, with independent detections reported by GECAM-B and AstroSat CZTI. MASTER-Net reported optical follow-up observations yielding only upper limits.
Wavelength coverage
- Gamma-ray / hard X-ray: Reported detections and timing/duration/spectral information from Fermi/GBM, GECAM-B (70–6000 keV; fluence in 10–1000 keV), and AstroSat CZTI (100–500 keV veto).
- Optical: MASTER-Tunka imaged the GBM error region starting
8760 s after trigger, reporting upper limits around ~19–19.8 mag (clear filter), with some fields shallower (17.4 mag).
No observations were mentioned in UV, IR, soft X-ray (narrow-field), radio, or mm.
Lightcurve and spectrum
- GECAM-B: light curve mainly one pulse; T90 = 13 ± 4 s (70–6000 keV). Time-averaged spectrum (T0−1 to T0+13 s, >70 keV) fit by a power law with index −2.16 (+0.14/−0.16); fluence (10–1000 keV) = (7.7 +0.9/−1.1)×10^-6 erg/cm^2.
- AstroSat CZTI: detected in 100–500 keV veto; light curve peak at 2026-02-19 14:04:53.66 UTC; T90 = 6.8 (+1.6/−1.3) s; peak count rate 345 (+63/−68) counts/s above background (combined quadrants).
Redshift
What’s special vs typical