GCN Circular 29558
Subject
GRB 210222B: KAIT Optical Upper Limit
Event
Date
2021-02-23T16:48:01Z (5 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 Swift GRB 210222B (Gropp et al.,
GCN 29545) starting at ~0.44 days after the burst. A total of
30x60s images were obtained in the clear (roughly R) filters.
We do not detect the optical afterglow (Gropp et al., GCN 29545;
Hu et al., GCNC 29546; Strausbaugh et al., GCNC 29547; Mong et al.,
GCNC 29548; Perley, GCNC 29549; Agui Fernandez et al., GCNC 29552;
Lipunov et al., GCNC 29554; Jelinek et al., GCN 29557) in the
co-add images, down to a limiting magnitude of ~20.0 mag calibrated
to the USNOB1.0 catalog.