General information
GRB 260109C is a Swift/BAT trigger (1434591) with an on-board localization at RA=123.728 deg, Dec=-35.258 deg (J2000) and a 3 arcmin (90%) error radius. Early X-ray/UV/optical follow-up reported only upper limits with no confirmed afterglow candidate.
Wavelength coverage
- Gamma-ray: Swift/BAT trigger; prompt emission reported.
- X-ray: Swift/XRT observed starting T0+86.8 s; no source detected in 1.3 ks of promptly downlinked data.
- UV: Swift/UVOT U-band finding chart starting T0+146 s; no credible afterglow candidate; typical 3-sigma limit ~19.2 mag.
- Optical: Rc-band non-detection to 20.8 (5 sigma) at T0+0.83 hr (iT30); z-band non-detection to 19.6 (5 sigma) at T0+40 min (LCO 1m/Sinistro).
No reports mentioned for IR, radio, sub-mm, neutrinos, gravitational waves, or high-energy (GeV/TeV) gamma rays.
Lightcurve and spectrum
- Duration: ~15 s (BAT).
- Peak count rate: ~4000 counts/s (15–350 keV) at ~T0+10 s (BAT).
Redshift
What’s special vs typical