TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2954 SUBJECT: GRB050117: MASTER optical observations DATE: 05/01/17 17:43:37 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A.Krylov, V.Kornilov, G.Borisov, D.Kuvshinov, A.Belinski, M.Kuznetsov, S.Potanin, G.Antipov, E.Gorbovskoy, N.Tyurina Sternberg Astronomical Institute, Moscow After SWIFT alert (GCN 2951) MASTER robotic telescope (http://observ.pereplet.ru) had imaging the corresponding area of the sky under the bad weather conditions. We have 50 unfiltered images of the error box (45s exposition, 6 square degrees field) started at 17 Jan 2005 14:58:40 UT (2 hours after GRB time). The limiting magnitude on the summ of the best 10 images was about 19.0. There is no OT within the 0'5 SWIFT error circle. The central part of the JPG-images are available at http://observ.pereplet.ru/images/SRG1806-20/050117/summ10.jpg This message may be cited. This work is partly supported by RFFI 04-02-16411. Mailto: lipunov@sai.msu.ru