{
  "bibcode": "2016GCN.19807....1X",
  "body": "L. P. Xin,   Y. J. Xiao,   X. M. Meng,   J. Y. Wei,   E. W. Liang,  X. G. Wang,\r\nY. G. Yang,  X. M. Lu,  L. Huang,   X. H. Han ,  H. B. Cai,   Y. L. Qiu,\r\nJ. Wang,   C. Wu,   J. S. Deng and H. L. Li  report:\r\n \r\nWe  observed  GRB 160815A (Markwardt et al. GCN 19794)  with\r\nGWAC-F60A 60cm optical telescope at 17:10:08 UT,  Aug. 15th 2016, \r\nabout 5.41 hours after the burst. \r\n\r\nThe optical afterglow (Marshall et al., GCN 19795; LaPorte et al., GCN 19081) \r\nwas  not detected in our 20*300 sec stacked R-band  images  down to the 3 sigma \r\nlimit  of  about 19.7 mag at the mid time  of 6.42 hours after the burst.\r\nThe brightness was calibrated by  USNO B1.0 stars.\r\n \r\nGWAC-F60A is operated by Guangxi university and NAOC, CAS, \r\nat Xinglong observatory, China.\r\n\r\nThe message may be cited.",
  "circularId": 19807,
  "createdOn": 1471420338000,
  "email": "xlp@bao.ac.cn",
  "subject": "GRB 160815A:  GWAC-F60A upper limit",
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "eventId": "GRB 160815A"
}