Einstein Probe WXT detects stellar flare from high proper motion star LSPM J2134+2836

AI Summary

The EP-WXT trigger 01709321472 detected on 2026-10-23 at 08:49:56 UTC was identified as a stellar flare rather than a gamma-ray burst. The event showed an image SNR of 8.9 in the 0.5-4 keV band with a net count rate of 0.05 counts/s, localized to coordinates RA=323.727°, Dec=28.58° with a positional uncertainty of 0.051°. Follow-up analysis by the Einstein Probe team determined the flare originated from the high proper motion star LSPM J2134+2836, with an estimated X-ray flux of 1×10⁻¹⁰ erg/s/cm² corresponding to a luminosity of ~1×10³¹ erg/s.

Measurements

Notices (1)

Einstein Probe WXT — GRB · Fri, 23 Oct 2026 08:49:56 GMT

GCN Circulars (1)

GCN-46012 — The EP-WXT trigger 01709321472 is likely a flaring star · Fri, 23 Oct 2026 09:24:58 GMT
The EP-WXT trigger 01709321472, detected on October 23, 2026, is likely a stellar flare from the high proper motion star LSPM J2134+2836, with an estimated flux of 1 x 10^-10 erg/s/cm^2 in the 0.5-4.0 keV range, corresponding to an X-ray luminosity of around 1 x 10^31 erg/s. This event was observed by the Einstein Probe (EP) space X-ray observatory.