{
  "bibcode": "2017GCN.20745....1W",
  "body": "J.Y. Wei (NAOC), X.H. Han (NAOC), X.M. Meng (NAOC), N. Leroy (LAL),\n S. Antier (LAL), C. WU (NAOC), L.P. Xin (NAOC), L. Huang (NAOC),\nY. Xu (NAOC), H.B. Cai (NAOC), J. Wang (NAOC), X.M. Lu (NAOC),\nY.L. Qiu (NAOC), J.S. Deng (NAOC), L. Cao (NAOC), S. Wang (NAOC),\nL. Jia (NAOC), S.C. Zou (NAOC), S.F. Liu (NAOC), Q.C. Feng (NAOC),\nH.L. Li (NAOC), D.W. Xu (NAOC), Y.J. Xiao (NAOC), W.L. Dong (NAOC),\nY.T. Zheng (NAOC), E.W.Liang (GXU), X.G.Wang (GXU), Y.G. Yang (HBNU),\nB. Cordier (CEA), S.N. Zhang (NAOC), D. Dornic (CPPM), B.B. Wu (IHEP),\nJ.L. Atteia (IRAP), D. G?tz (CEA), C.Lachaud (APC),\non behalf of the SVOM Gravitational Astronomy group report:\n\nWe observed about 3200 square degree (8 sky regions) of the skymap\nof the advanced LIGO trigger G275404, with SVOM/Mini-GWAC, at Xinglong\nObservatory of NAOC equipped with U9000 camera (FOV~400 square\ndegree/camera).\nSVOM/Mini-GWAC comprises 12 wide field angle cameras (aperture=7cm),\nworking with unfiltered band. The observations are operated in time-series\nmode, taking one exposure in 15 seconds (10s exposure + 5s readout).\nThe limit magnitude is ~12 mag in R band. We estimate a 46.6% prior\nprobability that these 8 regions contain the true location of the\nsource.\n\nThe coordinates of the 8 regions and observation time are list following:\n\nstart-obs(UTC)  end-obs(UTC)    Ra      Dec     Camera_ID\n2017-02-25      19:23:51.9      2017-02-25      20:41:04.7      10:33:59.6\n     +30:12:22                       C3\n2017-02-25      19:23:51.9      2017-02-25      20:41:06.2      10:38:05.6\n     +10:07:57                       C4\n2017-02-25      19:23:42.2      2017-02-25      22:13:19.6      17:18:04.0\n     +69:28:00                       C5\n2017-02-25      19:23:44.7      2017-02-25      22:13:38.0      17:21:47.1\n     +50:28:32                       C6\n2017-02-25      13:01:04.2      2017-02-25      21:37:38.1      09:21:25.5\n     +69:40:01                       C7\n2017-02-25      13:01:04.2      2017-02-25      21:37:39.7      09:23:01.6\n     +50:00:25                       C8\n2017-02-25      21:39:38.3      2017-02-25      22:13:28.5      20:00:36.6\n     +69:38:42                       C7\n2017-02-25      21:39:38.3      2017-02-25      22:13:25.5      20:01:12.7\n     +50:00:21                       C8\n\nThe first image (which is covered in our routine survey) was taken\n ~5 hours 29 minutes before the event trigger. No any significant\ntransient is found in our online pipeline. The image analysis is\nongoing in detailed processing with our offline pipeline.",
  "circularId": 20745,
  "createdOn": 1488078097000,
  "email": "wuchao.lamost@gmail.com",
  "subject": "LIGO/Virgo G275404: SVOM/Mini-GWAC: Observations of initial skymap",
  "submitter": "Chao Wu at NAOC  <wuchao.lamost@gmail.com>",
  "eventId": "LIGO/Virgo G275404"
}