TITLE:   GCN CIRCULAR
NUMBER:  35454
SUBJECT: GRB 240101B: KAIT Optical Upper Limit
DATE:    24/01/02 07:23:47 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 Swift GRB 240101B (Cenko et al.,

GCN 35449) starting at 7.38 hours after the burst. A total of

31x60s images were obtained in the clear (roughly R) filters.

We do not detect any optical afterglow candidate within the XRT

position error circle (Cenko et al., GCN 35449), neither in single

image, nor in the co-add images. The typical limiting magnitude of

our single clear image is about 18.5 mag calibrated to the PS1 catalog.