[vsnet-grb-info 27455] GRB 210222B: KAIT Optical Upper Limit
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Feb 24 01:48:52 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 29558
SUBJECT: GRB 210222B: KAIT Optical Upper Limit
DATE: 21/02/23 16:48:01 GMT
FROM: Weikang Zheng at UC Berkeley <weikang at 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.
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