{
  "bibcode": "2013GCN.14413....1X",
  "body": "D. Xu (DARK/NBI), C. Cao, S.M. Hu (SDU) report:\n\nWe observed the field of GRB 130420A (Page et al., GCN 14406) using\nthe 1m telescope located in Weihai, Shandong Province, China.\nObservations started at 11:41:32 UT, 2013-04-20 (i.e., 4.218 hr after\nthe BAT trigger) and 12x180s I-band frames were obtained.\n\nThe optical afterglow (Page et al., GCN 14406) is clearly detected in\nour stacked image to be of I=19.4 mag, calibrated with nearby USNO B1\nstars. It has decayed by about 0.5 mag, compared to the measurement in\nWatson et al. (GCN 14409).\n\nWe thank Dayong Ren for carrying out these observations.",
  "circularId": 14413,
  "createdOn": 1366466261000,
  "email": "dong.dark@gmail.com",
  "subject": "GRB 130420A: Weihai Optical Observations",
  "submitter": "Dong Xu at DARK/NBI  <dong.dark@gmail.com>",
  "eventId": "GRB 130420A"
}