{
  "bibcode": "2021GCN.30204....1Z",
  "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 the Swift GRB 210610B (Page et al.,\n\nGCN 30170) starting at ~10.46 hours after the Swift trigger (Page et al.\n\nGCN 30170). A total of 60x60s images were obtained in the clear (roughly R)\n\nfilter. The optical afterglow (e.g. Page et al., GCN 30170) was clearly\n\ndetected in each single image. We measured its brightness of 18.07 +/- 0.05\n\nmag at 10.46 hours after burst, and decayed to be 18.27 +/- 0.06 mag at\n\n12.20 hours after burst, calibrated to the Pan-STARRS1 catalog.",
  "circularId": 30204,
  "createdOn": 1623431162000,
  "email": "weikang@berkeley.edu",
  "subject": "GRB 210610B: KAIT Optical Detection",
  "submitter": "Weikang Zheng at UC Berkeley  <weikang@berkeley.edu>",
  "eventId": "GRB 210610B"
}