[vsnet-grb-info 15195] GRB140629A: Kanata/HOWPol optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16487
SUBJECT: GRB140629A: Kanata/HOWPol optical observation
DATE:    14/06/29 23:33:24 GMT
FROM:    Koji Kawabata at HASC,Hiroshima U  <kawabtkj at hiroshima-u.ac.jp>

K. Takaki, T. Nakaoka, Y. Moritani, K. S. Kawabata (Hiroshima Univ.) report 
on behalf of Kanata team:

We performed a series of optical imaging polarimetry for the optical 
afterglow of GRB140629A (Yurkov et al., GCN 16478, Xin et. al GCN 16480,
Bikmaev et al., GCN 16482) from 73 sec after the Swift/BAT trigger 
(Lien et al., GCN 16477) with HOWPol attached to the 1.5-m Kanata telescope 
at Higashi-Hiroshima Observatory, Japan. 

Calibrated with USNO-B1 catalogue, our quick-look photometry indicates that 
the R-band magnitude of the optical afterglow was 14.0 at the beginning of 
our observation, reached its peak brightness of 13.3 mag around 160 sec, 
and then smoothly declined. Further analysis is ongoing.