TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2103 SUBJECT: GRB030328: R upper limit after 6 hours by MASTER DATE: 03/04/06 19:24:32 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A. Krylov, V. Kornilov, G. Borisov, A. Belinski, I. Chilingarian, D. Kuvshinov, M. Kuznetsov, S. Potanin, V. Vitrischak Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow report: We had been observing the OT of GRB030328 (HETE #2650, Peterson and Price, GCN 1974) from 17:16UT 28/03/2003 (~5h after GRB) to 00:35UT 29/03/2003 (~13h after GRB). Sky conditions were quite poor, because of low position of the object (25 degrees above the horizont at culmination). We obtained about 70 one- to 3-minute exposures in R filter. There is no OT on the sum of exposures for the 1-st hour of observations up to 17.7 R magnitude (3 sigma). There is no OT on the sum of all images up to 18.3 R magnitude (3 sigma). It agrees with the powerlaw index alpha=-1 (GCN 1977, Peterson and Price). Summarized images avaliable at: http://observ.pereplet.ru/images/grb030328_1.gif - 1-st hour sum http://observ.pereplet.ru/images/grb030328_f.gif - whole sum This message may be cited.