TITLE: GCN CIRCULAR NUMBER: 38940 SUBJECT: EP250111a: SAO RAS optical upper limit DATE: 25/01/14 15:52:04 GMT FROM: Moskvitin Alexander at SAO RAS mosk@sao.ru

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).

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