GCN Circular 38940
Subject
EP250111a: SAO RAS optical upper limit
Date
2025-01-14T15:52:04Z (8 days ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
Via
Web form
A. S. Moskvitin and O. I. Spiridonova (SAO RAS),
report on behalf of the GRB follow-up team.
We observed the field of X-ray transient EP250111a detected by EP
(Zhao et al., GCN 38905) and Swift (Kennea et al., GCN 38910)
with the SAO RAS 1-m telescope Zeiss-1000 on January 11,
18:51:53--19:56:25 UT (t_mid - T0 = 18.057 hours = 0.7524 days).
We obtained 10 x 300 sec. images in Rc band.
We did not detect the OT (Fu et al., GCN 38906; Pankov et al.,
GCN 38913; Zheng et al., GCN 38916) in the stacked image
down to the limiting magnitude of R_lim > 21.15 (calibrated anainst
nearby USNO-B1 stars and not corrected for the MW extinction).