TITLE:   GCN CIRCULAR
NUMBER:  37511
SUBJECT: EP240913a/GRB 240913C: KAIT optical upper limit
DATE:    24/09/14 21:19:56 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 EP240913a/GRB 240913C (Li et al.,

GCN 37492; Yin et al., GCN Circ. 37493; Dasgupta et al., GCN 37505;

Pawar et al., GCN 37510) starting at 06:12 UT, Sep 14th, ~18.6

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 Swift-XRT error

circle of the X-ray counterpart candidate (Jiang et al., GCN 37497)

neither in single image, nor in the co-add images, consistent with

the reports from Asquini et al. (GCN 37499) and Zhu et al. (GCN

37500, 37501). The typical limiting magnitude of our single clear

image is about 19.5 mag, and about 20.5 mag in the co-add image.