TITLE: GCN CIRCULAR NUMBER: 41380 SUBJECT: GRB 250814A: KAIT optical upper limit DATE: 25/08/14 22:30:47 GMT FROM: Weikang Zheng at UC Berkeley <weikang@berkeley.edu> WeiKang Zheng (UCB) and Alexei V. Filippenko (UCB) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, observed the field of GRB 250814A (Fermi GBM team, GCN 41357; Caputo et al., GCN 41358) starting at 07:50:38, Aug. 14 UT, 939 seconds after the burst. A set of 120x60s clear (roughly R) filter images were obtained. Preliminary analysis do not reveal any new optical counterpart candidate within the Swift/XRT error circles (Caputo et al., GCN 41358), neither in single image, nor in the co-add images. Also no object was found at the afterglow candidate position reported by Karambelkar et al. (GCN 41377). Our upper limit is about 21.5 (Vega) mag at a mid time of 1.27 hours after the burst. Our result is consistent with the upper limit reported by other groups (Becerra et al., GCN 41362; Postigo et al., GCN 41367; Karambelkar et al., GCN 41372; Salazar et al., GCN 41375). View this GCN Circular online at https://gcn.nasa.gov/circulars/41380. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...