TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3750 SUBJECT: GRB050803: MASTER optical observations DATE: 05/08/03 20:47:19 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A.Krylov, V.Kornilov, G.Borisov, D.Kuvshinov, A.Belinski, E.Gorbovskoy, N.Tyurina, V.Vladimirov Sternberg Astronomical Institute, Moscow 198 sec after SWIFT GRB050803 detection (Tirgger_Num 148833) MASTER robotic telescope (http://observ.pereplet.ru) had imaging the corresponding area of the sky under the bad weather conditions on the evening sky near the horizont. We have first image by 200 mm camera with grisma up to 9m. The first unfiltred image on 355 mm camera was made at 28 min (19h32m25s UT))after GRB time due to technical problems(the limit is 14.5 m). There is no OT. Observations are continued. This work is supported by Moscow Union "OPTICA" and RFFI 04-02-16411. Mailto: lipunov@sai.msu.ru