{
  "bibcode": "2021GCN.30503....1Z",
  "body": "WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on\nbehalf of the KAIT GRB team:\n\nThe 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at\nLick Observatory, responded to Swift GRB 210725A (Bernardini et al.,\nGCN 30501) starting at 56 minutes after the burst. A total of\n30x60s images were obtained in the clear (roughly R) filters.\nWe do not detect any optical afterglow candidate within the XRT\nposition error circle (Bernardini et al., GCN 30501), neither in\nsingle image, nor in the co-add images. The typical limiting magnitude\nof our single clear image is about 18.5 mag calibrated to the PS1 catalog.",
  "circularId": 30503,
  "createdOn": 1627190435000,
  "email": "weikang@berkeley.edu",
  "subject": "GRB 210725A: KAIT Optical Upper Limit",
  "submitter": "Weikang Zheng at UC Berkeley  <weikang@berkeley.edu>",
  "eventId": "GRB 210725A"
}