[vsnet-grb-info 331] GRB 020812: optical observation at Bisei

[GCN Circulars <gcncirc@lheawww.gsfc.nasa.gov>]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1493
SUBJECT: GRB 020812: optical observation at Bisei
DATE:    02/08/15 07:30:39 GMT
FROM:    Yuji Urata at RIKEN  <urata@crab.riken.go.jp>

T. Kawabata (BAO), T. Morishita (OPU), T. Hatayama (BAO visitor),
Y. Urata (Titech / RIKEN), and H. Yamaoka (Kyushu U) report:

  "A full analysis of Bisei Astronomical Observatory (BAO) images (GCN
1489) of GRB 020812 was performed.  The entire error box was imaged
five times with 12 no-filter pointing observations (60 seconds
exposure each) by 1.01-m BAO telescope.  
 
 set     Time(UT)
  1  Aug 12 14:00-14:28
  2  Aug 12 14:31-14:55
  3  Aug 13 15:19-15:40
  4  Aug 13 15:43-16:02
  5  Aug 13 16:07-16:28
 
  The limiting magnitude for each images is mag 19.1 (3 sigma,
compared with USNO-A2.0 red magnitudes), although some images are poor
because of thin clouds.  

  Comparison with DSS II red images, no new object was detected down
to the limiting magnitude.  Also, the comparison between our 
observations, no notable variable object was detected."

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