GCN Circular 18439
Subject
GRB 151022A: Kanata/HOWPol optical observation
Date
2015-10-22T15:10:33Z (9 years ago)
From
Koji Kawabata at HASC,Hiroshima U <kawabtkj@hiroshima-u.ac.jp>
K. S. Kawabata, R. Itoh, T. Nakaoka, M. Yoshida (Hiroshima Univ.), K. Tsumura
(Tohoku Univ.), and K. Arimatsu (NAOJ) report on behalf of Kanata team:
We performed a series of optical imaging-polarimetry for the optical afterglow
of GRB151022A (D'Avanzo et al., GCN 18436) from 119 sec after the Swift/BAT
trigger with HOWPol attached to the 1.5-m Kanata telescope at Higashi-Hiroshima
Observatory, Japan.
We could not detect any afterglow within the XRT error circle reported in the
GCN 18436. We obtained the following preliminary upper limits (3-sigma) in our
first image (mid-time 134 sec after the trigger) calibrated with UCAC4:
Rc > 17.0
Further analysis is ongoing.