TITLE: GCN CIRCULAR NUMBER: 41417 SUBJECT: GRB 250818B: KAIT optical observations DATE: 25/08/18 21:38:07 GMT FROM: Weikang Zheng at UC Berkeley weikang@berkeley.edu

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).

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