TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2084 SUBJECT: GRB030329, optical observation DATE: 03/04/03 18:43:00 GMT FROM: Alexei Pozanenko at IKI, Moscow M.A. Ibrahimov, I.M. Asfandiyarov, B.B. Kahharov (Ulugh Beg Astronomical Institute of Uzbekistam Academy of Science), A.Pozanenko (IKI), V.Rumyantsev (on behalf of CrAO GRB team), G.Beskin (SAO) report: We have observed the OT found by Peterson and Price (GCN 1985) of GRB030329 with 1.5m telescope of High-altitude Observatory at Mt.Maidanak. The observation is carrying under good seeing conditions. Using star filed photometry by A. Henden (GCN2023) we obtained a prelimiary estimation of the OT magnitude: UT, Apr. 3 filter exposure mag Mid time 15:34:12 R 300 17.80 15:42:58 R 600 17.84 with a typical error ~ 0.05 Taking into account the data of R. Burenin et al. (GCN 2079) and E.Pavlenko et al. (GCN 2083) one can suggest that the re-brightening took place with a maximum early Apr. 3. This message may be cited.