TITLE: GCN CIRCULAR NUMBER: 40065 SUBJECT: GRB 250403A: KAIT optical observations DATE: 25/04/04 18:53:09 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 250403A (Julakanti

et al., GCN 40026; Fermi GBM team, GCN 40025) with a set of

120x60s images in the clear (roughly R) filters, at a mid time

of 16.0 hours after the trigger. We marginally detected the optical

afterglow (Starling et al., GCN 40028; Wu et al., GCN 40029;

Du et al., GCN 40031; Li et al., GCN 40032, Julakanti et al.,

GCN 40034; Ghosh et al., GCN 40039; Jiang et al., GCN 40041;

Pérez-Fournon et al., GCN 40043; Brivio et al., GCN 40044;

Xin et al., GCN Circ. 40045) in the coadd image with a brightness

of 21.2 +/- 0.4 mag (Vega).

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