{
  "bibcode": "2018GCN.23368....1H",
  "body": "Xuhui Han (NAOC), WeiKang Zheng (UC Berkeley) and Alexei V. Filippenko\n(UC Berkeley) report on behalf of the KAIT GRB team:\n\nThe 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at\nLick Observatory, responded to Swift GRB 181023A (Marshall et al.,\nGCN 23366) starting at 02:16:07 UT, ~12 minutes after the burst\nunder dusk twilight condition. Observations were performed in the\nclear (roughly R) filters, and the exposure time was 60s per image.\nObservations lasted for about 25 minutes before it set beyond KAIT\nhour agnle limit. We do not detect any optical afterglow candidate\nwithin the XRT position error circle (Marshall et al., GCN 23366)\nneither in single image, nor in the co-add images. The typical\nlimiting magnitude of our single clear image is about 19.0 mag\ncalibrated to the Pan-STARRS1 catalog.",
  "circularId": 23368,
  "createdOn": 1540268674000,
  "email": "weikang@berkeley.edu",
  "subject": "GRB 181023A: KAIT Optical Upper Limit",
  "submitter": "Weikang Zheng at UC Berkeley  <weikang@berkeley.edu>",
  "eventId": "GRB 181023A"
}