TITLE: GCN CIRCULAR NUMBER: 40310 SUBJECT: GRB 250430A: KAIT optical observations DATE: 25/05/01 21:27:09 GMT FROM: Weikang Zheng at UC Berkeley weikang@berkeley.edu

WeiKang Zheng 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 250403A (Parsotan et

al., GCN 40292; Wang et al., GCN 40299) with a set of 120x60s

images in the clear (roughly R) filters, at a mid time of 13.9

hours after the trigger. We marginally detected the optical

afterglow (Parsotan et al., GCN 40292; Odeh et al., GCN 40295;

Garnichey et al., GCN 40301; Komesh et al., GCN 40307) in the

coadd image with a brightness of 21.7 +/- 0.3 mag (Vega).

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