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GCN Circular 1344

GRB020331 optical observations with RIMOTS
2002-04-09T03:28:11Z (22 years ago)
Yuji Urata at RIKEN <>
N. Kawai, Y. Urata (Titech/RIKEN), M. Kohama, K. Torii (RIKEN),
 A. Yoshida (AGU/RIKEN), K. Ayani, T. Kawabata (Bisei Astronomical
 Observatory), M. Chaya, H. Shibata, K. Sakamoto, M. Yamauchi (Miyazaki
 Univ.)  on behalf of the RIBOTS/RIMOTS team
  We have observed covering the entire error circle of GRB020331
 (Ricker et al. GCN 1315) field with the RIMOTS 30-cm telescope.  The
 observations started at an early epoch (+1.6 hours after the burst).
 All the images were taken with 15 sec exposure and stacked for deeper
  From a comparison with the DSS-2 images we did not identify any new
 point source for the GRB.  We summarize the observing time and the
 R-band limiting magnitude (SN=3), which was estimated by the
 comparison of our non-filter data with the R band field photometry by
 Henden (GCN 1319).
 Summary of observations on 2002/03/31
  Time(UT)     Limiting R mag
  start end    (SN=3)
  18:10 18:59  14.9          15s x 39 frames combined
  19:00 19:59  14.2          15s x 51 frames combined
  20:00 20:12  13.7          15s x 13 frames combined
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