GCN Circular 23414
Subject
GRB 181110A: Kanata 1.5m optical observation
Date
2018-11-10T10:26:30Z (5 years ago)
From
Koji Kawabata at HASC,Hiroshima U <kawabtkj@hiroshima-u.ac.jp>
M. Yamanaka, M. Kawabata, K. S. Kawabata (Hiroshima Univ.)
report on behalf of Kanata team:
We performed optical imaging polarimetry to the field of the
GRB 181110A (Evans et al. GCN 23413) from 2018-11-10 08:44:48 UT
(77 seconds after the trigger) with HOWPol attached to the 1.5-m
Kanata telescope at Higashi-Hiroshima Observatory, Japan. Although
the first frames were severely affected by bright twilight sky,
in later frames a possible bright optical counterpart of the GRB
appeared at the position consistent with the Swift-UVOT observation
(Evans et al. GCN 23413). The magnitude of the counterpart was
R~14 mag (USNO B1.0) at 940 seconds after the trigger, suggesting
it brightened by ~4 mag within ~15 minutes. It further brightened
slightly (by a few 0.1 mag) and then declined smoothly.
Further analysis is ongoing.