TITLE: GCN CIRCULAR NUMBER: 37578 SUBJECT: EP240919a / GRB 240919A: KAIT optical upper limit DATE: 24/09/20 16:40:23 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, responded to EP240919a/GRB 240919A (Liang et al.,

GCN 37561; Liang et al., GCN Circ. 37563; Rodi et al., GCN 37572;

Wang et al., GCN 37574) starting at 03:03 UT, Sep 20th, ~12.7

hours after the trigger. A set of 30x60s images were obtained in

the clear (roughly R) filters. Preliminary analysis do not reveal

any new optical counterpart candidate within the EP-FXT error

circle of the X-ray counterpart (Liang et al., GCN 37561) neither

in single image, nor in the co-add images. The typical limiting

magnitude of our single clear image is about 19.5 mag, and about

20.5 mag in the co-add image.

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