{
  "subject": "GRB 210419C: KAIT Optical Upper Limit",
  "eventId": "GRB 210419C",
  "bibcode": "2021GCN.29840....1Z",
  "createdOn": 1618931836000,
  "circularId": 29840,
  "submitter": "Weikang Zheng at UC Berkeley  <weikang@berkeley.edu>",
  "email": "weikang@berkeley.edu",
  "body": "WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on\n\nbehalf of the KAIT GRB team:\n\n\nThe 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at\n\nLick Observatory, responded to Swift GRB 210419C (Moss et al.,\n\nGCN 29834) starting at 6.87 hours after the burst. A total of\n\n30x60s images were obtained in the clear (roughly R) filters.\n\nWe do not detect any new source within the enhanced XRT error circle\n\n(Beardmore et al., GCN 29839) in the co-add images, down to a limiting\n\nmagnitude of ~21.5 mag calibrated to the PS1 catalog."
}