GCN Circular 33085
Subject
GRB 221218A: KAIT Optical Upper Limit
Date
2022-12-19T18:50:23Z (2 years ago)
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 INTEGRAL GRB 221218A (Mereghetti et al.,
GCN 33082) starting at 0.78 days after the burst. A total of
23x60s images were obtained in the clear (roughly R) filters.
We do not detect any optical afterglow candidate within the IBAS
position error circle (Mereghetti et al., GCN 33082), 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.