GCN Circular 2068
GRB 030329: Observations with ANDICAM J. S. Bloom (CfA), M. Buxton (Yale), C. Bailyn (Yale), P. G. Van Dokkum (Yale), S. R. Kulkarni (Caltech) report: "We observed the afterglow of GRB 030329 (GCN #1985, GCN #1997), using CTIO 1.3m + ANDICAM on 2003 April 1.15 UT in photometric conditions. The OT was well detected in BVIJH at the following brightness levels: UT Start, Int Time B = 17.671 +/- 0.031 tgrb - t = 2.6676 day (03:33:29, 600 sec) V = 17.263 +/- 0.043 tgrb - t = 2.6761 day (03:45:52, 600 sec) I = 16.482 +/- 0.056 tgrb - t = 2.6870 day (04:01:30, 600 sec) Optical photometry was calibrated to the Henden secondary standards (GCN #2023). Zeropoint systematics dominate the uncertainties. Magnitudes have not been corrected for Galactic extinction. We intend to obtain an IR zeropoint and IR secondary standards over the next few nights. Assuming a negligible change in flux between observations, we find (V - I) = 0.781 +/- 0.070, confirming the V-I color reported in Li et al. (GCN #2064). We find (B - V) = 0.408 +/- 0.053, which is inconsistent with Li et al, but consistent with the B-V color reported Fitzgerald & Orosz (GCN #2056)." A color composite image of the field may be viewed at: http://http://www-cfa.harvard.edu/~jbloom/GRB/grb030329/ More information about ANDICAM can be obtained at: http://www.ctio.noao.edu/yale/parameters.html This message can be cited.