{
  "subject": "GRB 130427A : Xinglong TNT optical observation",
  "eventId": "GRB 130427A",
  "bibcode": "2013GCN.14492....1X",
  "createdOn": 1367171749000,
  "circularId": 14492,
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "email": "xlp@bao.ac.cn",
  "body": "L.P. Xin, J. Y. Wei, Y. L. Qiu,  J. Wang, \nJ. S. Deng, C. Wu, X.H. Han  report on behalf of EAFON team:\n\nWe began to observe the field of GRB 130427A  (Maselli, et al., GCN 14448)\nusing  80cm TNT telescope located at Xinglong observatory, China\nat 12:52:38 UT on 2013-04-28.  We obtained several B, V, R-band images.  \n\nThe optical counterpart is detected in all images. The prelinary analysis shows that\nits brightness is about R=18.3 mag, calibrated with USNO B2 stars, \nat the mean time of  29.08 h after the trigger time.\n\nThis message may be cited."
}