TITLE:   GCN CIRCULAR
NUMBER:  37000
SUBJECT: EP240801a: KAIT optical counterpart observations
DATE:    24/08/01 17:41:44 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 EP240801a from the Einstein Probe (Zhou et al. GCNC 36997)

starting at 09:27 UT, ~0.41 hours after the trigger. A set of clear

(roughly R) filter images were obtained. The optical counterpart

reported by Fu et al. (GCN 36998) and Li et al. (GCN 36999) was

clearly detected in our coadded images. The preliminary photometry

results are shown below calibrated to the PS1 catalog:


Tmid-T0(hr)    exp(s)  Mag    err

0.41           6x20s   19.86  0.07

0.54           6x40s   20.02  0.05

0.73           5x60s   20.05  0.04

0.93           5x60s   20.11  0.07

1.54           7x60s   20.17  0.06

1.93           9x60s   20.09  0.06