TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2146 SUBJECT: GRB030329: Optical Observations DATE: 03/04/18 06:19:46 GMT FROM: Vasilij Rumjantsev at CrAO V.Rumyantsev, E. Sergeeva (CrAO), V.Doroshenko (SAI MSU), E.Pavlenko, O.Antoniuk, N.Primak (CrAO), and A.Pozanenko (IKI) report: We continue to monitor the OT of GRB030329. Observations were made on April 8, 9, 10, 2003 in R and I (Johnson) spectral band with the 70-cm and 38-cm Cassegrain telescopes of CrAO. Based on filed photometry by A. Henden (GCN 2023) we estimate the OT magnitude as following Mid time, UT telescope exposure mag err Apr.08.9284 K-380 20x300s R 19.35 0.25 Apr.09.9179 AZT-8 8x150s R 19.56 0.19 Apr.10.8462 AZT-8 10x120s R 19.80 0.22 Apr.10.8615 AZT-8 10x120s I 19.32 0.25 This message may be cited.