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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1995 SUBJECT: GRB 030329: Optical Afterglow Observations DATE: 03/03/29 17:35:46 GMT FROM: Eli Rykoff at Univ. of Michigan/ROTSE <erykoff@umich.edu> Rykoff, E. S. and Smith, D. A. on behalf of the ROTSE collaboration report: We have observed the full error box of GRB 030329 (HETE trigger 2652), using the ROTSE-3A 0.45 meter telescope at Siding Springs Observatory, Australia, starting March 29, 13:05:19 UT (1.46 hours after the burst). Due to partly cloudy skies, our first usable image was taken at 13:08:45 UT. We initiated a sequence of 90 one-minute exposures, interrupted by a brief spell of light rain. We identify the bright counterpart reported by Price (1985) and Torii (GCN 1986), at the following coordinates: RA: 10 44 50.0 Dec: 21:31:17.8 Some of our detections (unfiltered, calibrated to USNO A2.0 R-band) are: UT (start) Mag (USNO R-band) 13:08:48 12.88 +/- 0.01 13:19:15 12.96 +/- 0.02 13:35:25 13.11 +/- 0.01 15:34:38 13.90 +/- 0.02 15:45:16 14.05 +/- 0.03 We continued to follow the transient until it dropped below our elevation cut. A preliminary ROTSE lightcurve can be found at: http://www.rotse.net/transients/grb030329/grb030329_lc0.ps Please note that our magnitude errors fluctuated as clouds drifted through the field of view.
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