General information
GRB 251220B is a short-duration gamma-ray burst detected at 2025-12-20 23:38:04–23:38:05 UT by multiple high-energy instruments, with an IPN triangulation subsequently reported. No confirmed electromagnetic counterpart is reported in the provided circulars.
Wavelength coverage
- Gamma-ray / hard X-ray: Fermi/GBM trigger and localization; SVOM/GRM light curve (T90); detections by Konus-Wind, Swift/BAT, and Mars-Odyssey/HEND with an IPN triangulation error box.
- Optical: MASTER-Kislovodsk reported only upper limits (clear band) during early tiling.
No observations were mentioned in X-ray, UV, infrared, radio, or GeV/TeV bands.
Lightcurve and spectrum
- Duration: T90 = 0.28 (+0.15/−0.10) s (15–5000 keV; SVOM/GRM).
Redshift
What’s special vs typical