{
  "bibcode": "2014GCN.16022....1W",
  "body": "J. Y. Wei,  L. P. Xin,  Y. L. Qiu,  J. S. Deng,   J. Wang, \r\nX. H. Han,  C. Wu,  H. L. Huang,  X. M. Meng, \r\nY. F. Xuan and Y. Xu on behalf of EAFON report:\r\n\r\nMini-GWAC system is located at Xinglong observatory, \r\nNational Astronomical Observatories, China,\r\nincluding 6 mounts and 12 Canon 85/f1.2 cameras.\r\nEach mount is equipped with 2 cameras.\r\nFor each camera, the Apogee U9000X CCD was used, which gives \r\nabout 400 square degree of FOV. The total field of view of this system\r\nis about 5000 sq.deg.\r\n\r\nThe field of INTERGRAL GRB 140320C (Mereghetti et al. GCN 16007) \r\nwas monitored by Mini-GWAC system continuously \r\nduring about 2 hrs before and 4 hrs after the burst.\r\nThe exposure time for each frame is 10 sec. \r\n\r\nNo any new optical counterpart in single frame  \r\nwas detected down to the 5 sigma upper limit of 13.1 mag \r\ncalibrated by nearby USNO B1.0 R2 mag, \r\nat the epoch of prompt emission phase.\r\nCombining 5 frames after the burst trigger initially \r\nwith total exposure time of 50 sec \r\ngives a 5 sigma upper limit of 13.7 mag.\r\n\r\nThis message may be cited.",
  "circularId": 16022,
  "createdOn": 1395410624000,
  "email": "xlp@bao.ac.cn",
  "subject": "GRB 140320C: Mini-GWAC prompt observation",
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "eventId": "GRB 140320C"
}