{
  "subject": "GRB020331 optical observations with RIMOTS",
  "eventId": "GRB 020331",
  "bibcode": "2002GCN..1344....1K",
  "createdOn": 1018322891000,
  "circularId": 1344,
  "submitter": "Yuji Urata at RIKEN  <urata@crab.riken.go.jp>",
  "email": "urata@crab.riken.go.jp",
  "body": "N. Kawai, Y. Urata (Titech/RIKEN), M. Kohama, K. Torii (RIKEN),\n A. Yoshida (AGU/RIKEN), K. Ayani, T. Kawabata (Bisei Astronomical\n Observatory), M. Chaya, H. Shibata, K. Sakamoto, M. Yamauchi (Miyazaki\n Univ.)  on behalf of the RIBOTS/RIMOTS team\n \n  We have observed covering the entire error circle of GRB020331\n (Ricker et al. GCN 1315) field with the RIMOTS 30-cm telescope.  The\n observations started at an early epoch (+1.6 hours after the burst).\n All the images were taken with 15 sec exposure and stacked for deeper\n inspection.\n \n  From a comparison with the DSS-2 images we did not identify any new\n point source for the GRB.  We summarize the observing time and the\n R-band limiting magnitude (SN=3), which was estimated by the\n comparison of our non-filter data with the R band field photometry by\n Henden (GCN 1319).\n \n Summary of observations on 2002/03/31\n  Time(UT)     Limiting R mag\n  start end    (SN=3)\n  18:10 18:59  14.9          15s x 39 frames combined\n  19:00 19:59  14.2          15s x 51 frames combined\n  20:00 20:12  13.7          15s x 13 frames combined\n \n This message may be cited."
}