TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2075 SUBJECT: GRB 030329 , SPM optical observations DATE: 03/04/02 23:08:34 GMT FROM: Sergej Zharikov at OAN IA UNAM S. Zharikov (OAN SPM, IA UNAM, Mexico), E. Benitez, J. Torrealba, J. Stepanian (IA UNAM, Mexico) report: We have observed the GRB030329 OT with 1.5m and 2.1m telescopes of SPM Observatory, BC, Mexico. A set of exposures in UBVRI Bessel filters was obtained with 1.5m telescope under photometric conditions. Standard stars RU 149 from Landolt's catalogue were used for photometric calibrations. The results of photometry are following: 31 March U B V R I UT 7:00 16.62 UT 7:13 17.27 UT 7.16 16.90 UT 7:21 16.46 UT 7:26 16.11 UT 7:31 16:65 UT 7:37 17.28 UT 7:43 16.84 UT 7:49 16.08 UT 7:54 16.05 UT 8:48 16.58 UT 8:54 17.30 UT 8:59 16.92 UT 9:05 16.51 UT 9:11 16.11 UT10:08 16:59 UT10:13 17.27 UT10:19 16.83 UT10:60 16:60 UT10:31 16:22 Errors are about 0.03. Spectrum of the optical afterglow of GRB 030329 were obtained at the same night with the 2.1-m telescope and B&Ch spectrograph (600l/mm). The spectra cover the wavelength range of 6100 to 8200 AA with a resolution of about 2.2A/pix. The spectral data analysis is in progress. This message may be cited.