General information
GRB 251219A is a short, soft burst detected at 2025-12-19 02:36:31.55–31.60 UTC by GECAM-B and SVOM/GRM, with indications it may be a magnetar X-ray burst rather than a cosmological GRB.
Wavelength coverage
- Gamma-rays / hard X-rays: detected by GECAM-B and SVOM/GRM.
No observations were mentioned in X-ray (soft), optical/UV, infrared, radio, or TeV bands.
Lightcurve and spectrum
- Duration: T90 = 0.22 +0.08/-0.16 s (~70–6000 keV; GECAM-B).
- Duration: T90 = 0.16 +0.12/-0.02 s (15–5000 keV; SVOM/GRM).
- Spectral note: emission mainly detected below 200 keV (GECAM-B).
Redshift
What’s special vs typical
- The short duration and soft emission, together with a localization reported consistent with SGR 1830-0645, suggest this may be a magnetar X-ray burst rather than a typical short GRB.