GCN Circular 42713
Subject
The EP-WXT trigger 01709247588: more evidence of flaring star from Mondy optical observations
Date
2025-11-17T09:56:34Z (25 days ago)
From
Alina Volnova at IKI RAS <alinusss@gmail.com>
Via
Web form
A. Volnova (IKI), E. Klunko (ISTP), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of the EP-WXT trigger 01709247588 (Feng et al., GCN 42510) with the AZT-33IK 1.5m telescope of the Sayan Solar Observatory (Mondy) in the R-filter starting Oct., 29, 2025, UT 16:48:48, and taking several frames with 120 s exposures. The Emission-line Star PM J04472+2038 likely associated with the transient is clearly detected and not saturated. Preliminary photometry and observational details are the following:
Date UT start MJD Exp. Filter Star Err. UL
(mid) (n*s) (3sigma)
2025-10-29 16:48:48 60977.71098 15*120 R 13.25 0.08 22.2
The photometry is based on several nearby USNO-B1.0 stars (R2-magnitudes) and is not corrected for the Galactic extinction, all magnitudes are in Vega system. The star PM J04472+2038 is at least 0.4 mag brighter in our observations comparing to USNO-B1.0 and UCAC catalogues: UCAC R = 13.99 +/- 0.09, USNO-B1.0 R1 = 13.65, R2 = 14.07. This 0.4m brightness increase 5.5 hours after the EP-WXT trigger may confirm the connection between EP-WXT 01709247588 and the stellar flare.