TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2083 SUBJECT: GRB030329, optical observation DATE: 03/04/03 18:22:36 GMT FROM: Alexei Pozanenko at IKI, Moscow E.Pavlenko, V.Rumyantsev, O.Antoniuk, N.Primak (CrAO) and A.Pozanenko (IKI) report: We continue to monitor the OT of GRB030329 (see also GCN 2005, 2028, 2050, 2067). The OT found by Peterson and Price (GCN 1985) was imaged Cassegrain 38-cm telescope of CrAO. Several 300 sec. exposures in R (Johnson) spectral band were obtained during Apr. 2. Based on filed photometry by A. Henden (GCN 2023) we estimate the OT magnitude: Mid time exposure R (UT) 2.7648 5x300c 17.83 +/- 0.08 2.7929 5x300c 17.76 +/- 0.08 2.8436 5x300c 17.89 +/- 0.07 2.8739 5x300c 17.76 +/- 0.09 After steep decay between Apr 1. and Apr. 2 we observed a flattening of light curve which may be a start of new episode of re-brightening. This message may be cited.