{
  "bibcode": "2018GCN.23033....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, observed the field of Swift GRB 180720B\n(Siegel et al., GCN 22973) each night from 21 to 24 UT, at a mean time\nof 0.855, 1.886, 2.883 and 3.874 days, respectively, after the burst.\nObservations were performed with a sequence in the B, V, R, I and\nclear (roughly R) filters, and the exposure time was 60 s per image.\nThe optical afterglow (Martone et al., GCN 22976) was clearly detected\nand we measure its clear band mag to be 18.5, 19.6, 20.5 and 20.9,\nrespectively, calibrated to the SDSS catalog.",
  "circularId": 23033,
  "createdOn": 1532477558000,
  "email": "weikang@berkeley.edu",
  "subject": "GRB 180720B: KAIT Optical Observations",
  "submitter": "Weikang Zheng at UC Berkeley  <weikang@berkeley.edu>",
  "eventId": "GRB 180720B"
}