TITLE: GCN CIRCULAR NUMBER: 38925 SUBJECT: EP250108a / AT 2025kg: SAO RAS optical observations DATE: 25/01/13 21:42:08 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 EP250108a detected by EP-WXT (Li et al. GCN 38861) with the SAO RAS 1-m telescope Zeiss-1000 on January 11, 17:34:02--18:47:16 UT (t_mid - T0 = 3.2362 days). We obtained 8 x 300 sec images in Rc band.

The OT (Eyles-Ferris, GCN 38878; Zhu et al., GCN 38885; Malesani et al., GCN 38902; Kumar et al., GCN 38907; Zhu et al., GCN 38908, Levan et al., GCN 38909; Izzo, GCN 38912; Zou et al., GCN 38914) is marginally detected in our stacked image with the brightness of R = 20.56 +/- 0.27 (calibrated anainst nearby USNO-B1 stars and not corrected for the MW extinction).

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