TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2958 SUBJECT: GRB050117: optical observation DATE: 05/01/17 22:59:47 GMT FROM: Alexei Pozanenko at IKI, Moscow R. Karimov, M. Ibrahimov, B. Kahharov, I. Asfandiyarov, D. Sharapov (UBAI), A.Pozanenko (IKI), V.Rumyantsev (CrAO), G.Beskin (SAO) report: We observed error box of Swift GRB050117 (Burrows, et al. GCN 2951; Sakamoto, et al. GCN 2952) with 1.5m telescope of Mt.Maidanak high-altitude observatory. R-band images (5 x 300 s, 4 x 240 s exposures) were taken between 15:48 and 17:21 (UT) Jan. 17. In comparison with DSS2 (red plate) no new source down to R=20 was found in a stacked image within refined XRT error box (Hill, et al. GCN 2955). More detailed analysis is in a progress. This message may be cited.