TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3221 SUBJECT: GRB050410: MASTER optical observations DATE: 05/04/10 19:15:01 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 114299 MASTER robotic telescope (http://observ.pereplet.ru) had imaging the corresponding area of the sky under the bad weather conditions at 17:14:08.03 UT (5h after GRB Time, OUR SUNSET ). There are no new object up to 14.7 on unfiltered image of the error box (30s exposition, 6 square degrees field). The limit on summ (between 18h17m - 18h30m UT) is about 18.5 . We have about 50 images. The JPG-images of summ are available at http://observ.pereplet.ru/images/GRB050410/summ1.jpg This message may be cited. This work is supported by Moscow Union "Optic" and partly supported by RFFI 04-02-16411. Mailto: lipunov@sai.msu.ru