TITLE: GCN CIRCULAR NUMBER: 18265 SUBJECT: GRB 150910A: KAIT Optical Afterglow Detection DATE: 15/09/10 10:00:52 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 150910A (Pagani et al., GCN 18264) starting at 09:34:20 UT, ~30 minutes after the burst. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20 s per image. The UVOT afterglow reported by Pagani et al. (GCN 18264) was clearly detected in all filters. The brightness is about R~16.2 mag at ~30 minutes after the burst, and is decreasing. Follow-up observations are encouraged.