TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2080
SUBJECT: GRB030329: optical observations at Tokyo Tech
DATE:    03/04/03 11:56:51 GMT
FROM:    Nobuyuki Kawai at Tokyo Tech  <nkawai@hp.phys.titech.ac.jp>

R. Sato, Y. Yatsu, M. Suzuki, and N. Kawai (Tokyo Tech) report:

We have observed the afterglow (Peterson and Price GCN 1985, Torii GCN
1986) of GRB030229 (H2652, Vanderspek et al. GCN 1997) on the nights
of 2003 Apr 29, 30, and 31 at Tokyo Tech, Tokyo, Japan, using a 30 cm
SC telescope with unfiltered AP 6E CCD camera.  The observationl
started at 12:57 UT (80 min after the GRB trigger).

We have estimated the R magnitude using USNO 2.0 stars U1050_06349885
(R=13.2), B:U1050_06348771 (R=14.2), and C:U1050_06351075 (R=14.0).
The results are shown in the table below.  The dip and rebrightening
at t0+1.2d (Lipkin et al. GCN 2045) was detected in our data too.

 t-t0 (days)    R mag   err

   0.0620      12.552  0.023
   0.1484      13.370  0.029
   0.1943      13.604  0.034
   0.2373      13.799  0.043
   0.2970      14.145  0.074
   0.9457      15.987  0.127 
   1.0151      16.167  0.081
   1.0936      16.504  0.125
   1.2172      16.316  0.140 
   2.0050      17.087  0.212
   2.1238      17.148  0.207

The images on the first night and our light curve can be found at
http://www.hp.phys.titech.ac.jp/nkawai/030329/index_e.html.

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