[vsnet-grb-info 4329] GRB 070220: Observation with the KANATA 1.5m telescope

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6117
SUBJECT: GRB 070220: Observation with the KANATA 1.5m telescope
DATE:    07/02/20 11:00:27 GMT
FROM:    Akira Arai at Hiroshima U  <arai-akira at hiroshima-u.ac.jp>

A. Arai, M. Uemura and T. Uehara (Hiroshima Univ.), 
report on behalf of the KANATA GRB team:

 We perfomed optical imaging of the field of GRB070220 (GCN 6114) at 
9:59-10:20 UT 20 Feb. using TRISPEC attached to the KANATA 
1.5-m telescope at Higashi-Hiroshima Observatory, Japan.  
We obtained 10 Rc-band images with a 123-s exposure time.  
The images were calibrated with neighbor stars 
in the USNO A2.0 catalog  (r mag ).

We cannot significantly detect the optical afterglow 
at the position of the X-ray afterglow reported in GCN 6114 in our images. 
The limit magnitude is estimated to be 21.2 (3-sigma).   

UT                      Limit mag in Rc    Exp. Time
Feb. 20.42381               21.2             123 * 10

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