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GCN Circular 36845

Subject
EP240708a: KAIT optical upper limit
Date
2024-07-10T19:14:53Z (8 days ago)
From
Weikang Zheng at UC Berkeley <weikang@berkeley.edu>
Via
legacy email
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 the fast X-ray transient EP240708a

from the Einstein Probe (Chen et al. GCNC 36838) starting at 9.13

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 10 arcsec radius

EP-FXT error box (Hu et al. GCN 36840) neither in single image,

nor in the co-add images, consistent with the reports from

Lai et al. (GCN 36839) and Wu et al. (GCN 36841), though shallower

than Jiang et al. (GCN 36842). 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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