GCN Circular 41417
Subject
GRB 250818B: KAIT optical observations
Event
Date
2025-08-18T21:38:07Z (7 days ago)
From
Weikang Zheng at UC Berkeley <weikang@berkeley.edu>
Via
email
WeiKang Zheng (UCB), Xuhui Han (NAOC), Pinpin Zhang (NAOC) and
Alexei V. Filippenko (UCB) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at
Lick Observatory, observed the field of GRB 250818B (Wang et al.,
GCN 41405) with a set of 90x60s images in the clear (roughly R)
filters, at a mid time of 8.0 hours after the trigger. We clearly
detected the optical afterglow (Kumar et al., GCN 41406; Yao et
al, GCN 41409) in the coadd image with a brightness of 19.9 +/-
0.2 mag (Vega).