General information
EP260602b is an Einstein Probe WXT trigger for which JinShan follow-up identified an uncatalogued optical source within the EP/WXT error circle. The source is reported at R.A. = 273.4738 deg, Dec. = 7.5712 deg and was fading in r band about 1 hour after the trigger, making it the proposed optical counterpart.
Wavelength coverage
- X-ray: the event was originally detected as an Einstein Probe WXT trigger.
- Optical: JinShan 100B/100C obtained r-band imaging and detected a decaying source with r ~ 19.0 mag at ~1.0 hr post-trigger.
No UV, infrared, radio, gamma-ray, or spectroscopic observations are mentioned.
Lightcurve and spectrum
- The optical source is described as decaying.
- The reported brightness is r ~ 19.0 mag at a median time of ~1.0 hr post-trigger.
- No spectrum is reported.
Redshift
What’s special vs typical
- The notable feature is the prompt identification of an uncatalogued fading optical source within the EP/WXT error circle, which is stronger evidence than a bare trigger notice but still short of a fully characterized transient.