TITLE: GCN CIRCULAR NUMBER: 41586 SUBJECT: EP250828a: KAIT optical upper limit DATE: 25/08/29 06:16:36 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 EP250828a (Liu et al.,

GCN 41574) starting at 09:30, Aug 28 UT, about 1.97 hours after

the burst. A set of clear (roughly R) filter images were obtained.

In our coadd image, we did not detect the reported afterglow

(Taguchi et al., GCN 41582; Yao et al., GCN 41583; Fu et al., GCN

41584) down to a limiting mag of 20.5 mag (Vega) at a mid-time of

2.67 hours after the burst.

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