Back

GCN Circular 1343

Subject

GRB020124 optical observations with RIBOTS/RIMOTS

Date

2002-04-09T03:12:04Z (23 years ago)

From

Yuji Urata at RIKEN <urata@crab.riken.go.jp>

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 GRB020124
 (Ricker et al. GCN 1220Loading...
 
 ) field with the RIBOTS/RIMOTS 30-cm
 telescopes.  The observations started at an early epoch (+1.3 hours
 after the burst).  All the images were taken with 15 sec exposure and
 stacked for deeper inspection.
 
  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 1251Loading...
 
 ).
 
 Summary of observations on 2002/01/24
 
  Time(UT)     Limiting R mag
  start end    (SN=3)
  12:00 12:57  17.8          15s x 61 frames combined (RIMOTS)
  16:19 16:59  18.6          15s x 59 frames combined (RIBOTS)
  17:00 17:59  18.8          15s x 87 frames combined (RIBOTS)
  18:00 18:59  19.1          15s x 87 frames combined (RIBOTS)
  19:00 19:59  19.1          15s x 87 frames combined (RIBOTS)
  20:00 20:59  17.7          15s x 87 frames combined (RIBOTS)
 
 This message may be cited.