GCN Circular 40294
Subject
GRB 250430A: Kanata optical upper limit
Date
2025-04-30T18:52:29Z (a day ago)
From
Koji Kawabata at HASC,Hiroshima U <kawabtkj@hiroshima-u.ac.jp>
Via
email
K. S. Kawabata, T. Hori, T. Nakaoka (Hiroshima Univ.) report on
behalf of Kanata team:
We performed optical imaging polarimetry to the field of the
GRB 180720B (Parsotan et al. GCN 40292; Lipunov et al. GCN 40291) from
2025-04-30 17:34:03 UT (162 seconds after the trigger) with HONIR
attached to the 1.5-m Kanata telescope at Higashi-Hiroshima Observatory,
Japan. We did not detect any new optical source up to a limiting
magnitude of Rc = 16.0 (3-sigma; Vega mag) at the position of the UVOT
source in our first 30 second exposure.