TITLE: GCN CIRCULAR NUMBER: 2084 SUBJECT: GRB030329, optical observation DATE: 03/04/03 18:43:00 GMT FROM: Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru> 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.