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
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