TITLE: GCN CIRCULAR NUMBER: 37095 SUBJECT: EP-WXT trigger 01709018832: KAIT optical observations of the star flare DATE: 24/08/07 22:01:22 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, automatically responded to the fast X-ray

transient WXT trigger 01709018832 from the Einstein Probe (Jiang

et al. GCNC 37090) starting at 06:49 UT, 27 minutes after the

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

We do not detect any new optical counterpart in the EP/FXT

errorbox (Jiang et al. GCNC 37090). However, the star within the

EP/FXT errorbox (Gaia DR3 2445442335531658752), as pointed out by

Jiang et al. (GCNC 37090), was clearly detected in all of our images.

Photometry shows its magnitude steadily decayed from ~15.1 mag at

~0.46 hours to ~16.2 mag at ~5.26 hours after the trigger. We thus

confirm WXT trigger 01709018832 is truly from this star flare,

consistent with the X-ray flare from the same star as suggested

by Jiang et al. (GCNC 37090).

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