General information
GRB 251214D is a long-duration gamma-ray burst detected in hard X-ray/gamma-rays, reported by AstroSat/CZTI and GECAM-B around 2025-12-14 21:24 UTC. Reported durations are in the tens of seconds, with multiple pulses noted by GECAM-B.
Wavelength coverage
- Hard X-rays (20–200 keV): detected by AstroSat/CZTI.
- Hard gamma-rays (100–500 keV): detected by the AstroSat CZTI CsI anticoincidence (veto) detector.
- Gamma-rays (70–6000 keV): detected by GECAM-B.
No observations were mentioned in optical, NIR, UV, radio, or soft X-ray bands.
Lightcurve and spectrum
- T0 (GECAM-B on-ground trigger time): 2025-12-14T21:24:17.950 UTC.
- Multiple pulses reported in 70–6000 keV (GECAM-B).
- T90 (GECAM-B, 70–6000 keV): 28.5 (+6.5/−5.0) s.
- Light-curve peak time (AstroSat/CZTI, 20–200 keV): 2025-12-14 21:24:21.50 UTC; peak rate 71 (+34/−11) counts/s; total 576 (+192/−210) counts.
- T90 (AstroSat/CZTI, 20–200 keV): 16 (+3/−7) s.
- Light-curve peak time (AstroSat veto, 100–500 keV): 2025-12-14 21:24:21.75 UTC; peak rate 231 (+68/−36) counts/s; total 1844 (+413/−469) counts.
- T90 (AstroSat veto, 100–500 keV): 20 (+2/−8) s.
Redshift
What’s special vs typical