General information
FRB 20251229A is a new repeating fast radio burst source reported by CHIME/FRB, with multiple bursts detected over about one week and an updated baseband localization. Optical imaging with COLIBRÍ/DDRAGO finds no new or variable source within the FRB localization region to deep r/z limits.
Wavelength coverage
- Radio: CHIME/FRB detections at 400–800 MHz; reported peak flux and fluence for the brightest burst.
- Optical: COLIBRÍ/DDRAGO observations in r and z with non-detections (upper limits).
No observations were mentioned in gamma-ray, X-ray, UV, infrared, millimeter/sub-millimeter, or TeV bands.
Lightcurve and spectrum
- Peak flux (brightest burst, 2026-01-01): 30 ± 3 Jy (400–800 MHz).
- Fluence (brightest burst, 2026-01-01): 160 ± 16 Jy ms (400–800 MHz).
Redshift
- The discovery report notes that, assuming an average intergalactic contribution to the DM (Macquart relation), the FRB redshift is expected to be within ~0.1 (i.e., z ≲ 0.1).
What’s special vs typical
- Reported as a potentially hyperactive repeating FRB, with three bursts in rapid succession despite low daily CHIME exposure for this declination.
- Low DM compared to the line-of-sight Galactic contribution suggests a relatively nearby extragalactic repeater (DM-implied z ≲ 0.1).