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 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.