TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2067 SUBJECT: GRB030329: Optical observations DATE: 03/04/02 01:25:34 GMT FROM: Vasilij Rumjantsev at CrAO E.Pavlenko, V.Rumyantsev, O.Antoniuk, N.Primak (CrAO) and A.Pozanenko (IKI) report: We continue to monitor the OT of GRB030329 (GCN 2005, 2028, 2050). The OT found by Peterson and Price (GCN 1985) was imaged Cassegrain 38-cm telescope of CrAO. Several 240 sec. exposures in R (Johnson) spectral band were obtained. Based on filed photometry by A. Henden (GCN 2023) we estimate the OT magnitude as Mid Time (UT) exposure OT (R) Apr 1.8754 4x240 sec 17.07+/-0.05 Also we refined our estimations of OT within March 29-31. Cassegrain 38-cm (CCD SBIG ST-7): JD Hel UT V R 52728.2526 29.7526 - 14.03 +/- 0.03 52728.4934 29.9934 15.15 +/- 0.02 - 52728.5072 30.0072 15.22 +/- 0.04 - 52729.2689 30.7689 - 16.44 +/- 0.04 52729.4301 30.9301 - 16.40 +/- 0.06 52730.2435 31.7435 - 16.92 +/- 0.04 52730.3868 31.8868 - 16.90 +/- 0.08 52730.4023 31.9023 - 16.91 +/- 0.06 This message may be cited.