TITLE: GCN CIRCULAR NUMBER: 29533 SUBJECT: GRB 210217A: KAIT Optical Observations DATE: 21/02/18 17:57:39 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 the Swift GRB 210217A (Simpson et al., GCN 29521) starting at ~4.27 hours after the Swift trigger. A total of 30x60s images were obtained in the clear (roughly R) filters. We marginally detect the optical afterglow (Simpson et al., GCN 29521; Zhu et al., GCN 29523) in the coadd image with a mag of 20.8 +/- 0.3, calibrated to the Pan-STARRS1 catalog.