GCN Circular 15541
Subject
GRB 131128A: Kanata/HOWPol optical observation
Date
2013-11-29T03:01:30Z (10 years ago)
From
Koji Kawabata at HASC,Hiroshima U <kawabtkj@hiroshima-u.ac.jp>
K. S. Kawabata, R. Itoh, N. Ebisuda, I. Ueno (Hiroshima Univ.)
report on behalf of Kanata team:
We performed a series of optical imaging (polarimetric mode) for
the optical afterglow of GRB 131128A (Sonbas et al., GCN 15533;
Xu et al., GCN 15535; Gorbovskoy et al, GCN 15536; Goad et al.,
GCN 15538; Sonbas et al., GCN 15540) using HOWPol attached to
the 1.5-m Kanata telescope at Higashi-Hiroshima Observatory, Japan.
Our first 30 sec exposure began at t=360 sec since Swift/BAT trigger
and we detected the afterglow located at 9" west and 4" north of the
bright star, USNO-B 2766-00858-1 (R2 = 11.63 mag). The magnitude of
the afterglow is preliminarily estimated to be about R=17.5, although
it might be still contaminated by the neaby bright star. The afterglow
quickly decayed and became fainter than ~18 mag at t=620 sec.