TITLE:   GCN CIRCULAR
NUMBER:  37191
SUBJECT: EP240816b: KAIT optical upper limit
DATE:    24/08/16 17:14:11 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 the fast X-ray transient EP240816b

from the Einstein Probe (Yang et al. GCN 37185) starting at 07:42

UT, Aug 16th, ~6.0 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 (Yang et al. GCN 37185), neither in

single image, nor in the co-add images, consistent with the reports

from An et al. (GCN 37186) and Lipunov et al. (GCN 37187). The

typical limiting magnitude of our single clear image is about 19.5

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