TITLE:   GCN CIRCULAR
NUMBER:  34001
SUBJECT: GRB 230618A: KAIT Optical Observations
DATE:    23/06/18 09:20:07 GMT
FROM:    Weikang Zheng at UC Berkeley <weikang@berkeley.edu>

WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on

behalf of the KAIT GRB team:


The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at

Lick Observatory, responded to GRB 230618A detected by Swift

(Page et al., GCN 33989) starting at 04:31:35 UT, about 0.69 hours

after the bust. Observations were performed in the clear (roughly R)

filter, and the exposure time was 60s per image, with a total of 31

images were obtained. We marginally detected the optical afterglow

reported by Strausbaugh et al. (GCN 33992) in our coadd image

in clear band, which we measured its brightness of 20.8 +/- 0.3 mag

at a mid time of ~0.79 hours after the burst, calibrated to the

Pan-STARRS1 catalog.