[vsnet-grb-info 13149] GRB 130427A: Kanata/HOWPol optical imaging polarimetry
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Apr 28 19:21:28 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 14486
SUBJECT: GRB 130427A: Kanata/HOWPol optical imaging polarimetry
DATE: 13/04/28 10:21:20 GMT
FROM: Koji Kawabata at HASC,Hiroshima U <kawabtkj at hiroshima-u.ac.jp>
R. Itoh, K. Kawaguchi, Y. Moritani, K. Takaki, K. S. Kawabata, M. Ohno,
H. Takahashi, Y. Tanaka, and M. Yoshida (Hiroshima Univ.) report on behalf
of Kanata team:
We performed a series of optical imaging polarimetry for the optical
afterglow of GRB 130427A (Elenin et al., GCN 14450) from 3.87 hr through
10.04 hr after the Swift/BAT trigger (Maselli et al., GCN 14448) with HOWPol
attached to the 1.5-m Kanata telescope at Higashi-Hiroshima Observatory, Japan.
Our quick-look analysis indicates that the R-band magnitude of the optical
afterglow was 15.9 at the beginning of our observation, and then smoothly
declined. Its decline rate between 3.87 hr and 10.04 hr can be approximated by
a single power-low decay with an index -1.0. The polarization seems not so
large (<~3%) in that period. Further analysis is ongoing.
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