{
  "bibcode": "2019GCN.25629....1W",
  "body": "J. Y. Wei (NAOC), X. H. Han (NAOC), N. Dagoneau (CEA/AIM), J. Wang (GXU),\nN. Leroy (CNRS/LAL)\n\non behalf of the SVOM Multi Messenger Astronomy and GWAC teams:\nhttp://www.svom.fr/en/svom-mma-and-gwac-team\n\nWe observed 16 sky regions (total: 2400 square degrees with overlaps)\nto cover the skymap of the advanced LIGO/Virgo trigger S190828l,\nwith SVOM/GWAC, at Xinglong Observatory equipped with a set of two\ntypes of wide angle cameras: FFOV cameras (FOV~900 square degrees/camera,\naperture = 3.5 cm) and JFOV cameras (FOV~150 square degrees/camera,\naperture = 18 cm). SVOM/GWAC currently comprises 4 FFOV cameras and\n16 JFOV cameras, working with unfiltered band. The observations are\noperated in time-series mode, taking one exposure every 25 seconds\n(20s exposure + 5s readout). We estimate a 9.5% prior probability\nthat the 16 observed and processed regions contain the true location of\nthe source.  The images were taken between ~5 hours and ~12 hours after\nthe event trigger time.\n\nThe coordinates of the 16 sky regions and observation times are listed\nbelow:\n\nNo. Ra �Dec start-obs(UTC) �end-obs(UTC) ���Camera_TYPE\n\n1 00:22:12.55 35:47:18.96 2019-08-28 14:58:26 2019-08-28 15:16:39 JFOV \n2 00:16:40.40 47:47:40.20 2019-08-28 14:59:15 2019-08-28 15:17:03 JFOV \n3 00:05:09.89 34:55:44.40 2019-08-28 15:00:32 2019-08-28 15:17:08 JFOV \n4 01:11:41.69 47:17:32.64 2019-08-28 15:07:01 2019-08-28 15:17:08 JFOV \n5 01:43:32.26 64:07:03.00 2019-08-28 13:53:25 2019-08-28 16:51:08 JFOV \n6 00:07:40.03 51:45:14.40 2019-08-28 16:41:24 2019-08-28 16:44:15 JFOV \n7 00:13:04.03 64:02:39.84 2019-08-28 17:05:25 2019-08-28 17:22:48 JFOV \n8 02:38:20.69 47:18:19.08 2019-08-28 17:04:13 2019-08-28 17:22:03 JFOV \n9 01:31:55.32 34:55:32.16 2019-08-28 17:09:05 2019-08-28 17:22:03 JFOV \n10 21:55:06.96 10:04:51.24 2019-08-28 16:04:03 2019-08-28 16:20:14 JFOV \n11 21:55:29.52 -1:58:15.89 2019-08-28 16:00:25 2019-08-28 16:20:14 JFOV \n12 21:59:13.44 48:02:44.52 2019-08-28 13:40:52 2019-08-28 14:06:20 JFOV \n13 22:05:10.08 34:10:09.48 2019-08-28 12:08:19 2019-08-28 19:00:58 JFOV\n14 23:07:07.68 09:08:42.00 2019-08-28 17:49:12 2019-08-28 17:54:27 JFOV \n15 23:44:10.08 13:41:13.56 2019-08-28 18:09:03 2019-08-28 18:26:03 JFOV \n16 00:58:52.99 30:19:11.28 2019-08-28 17:25:15 2019-08-28 17:53:12 JFOV\n\nThe sky coverage map is available at: \nhttp://cmm.svom.cn/gwpub/O3/S190828l/S190828l.png\n(user:svomo3 pwd:gwo3)\n\nThe weather conditions were hazy during the observations. A 3 sigma\nlimiting magnitude of about 16.3 mag in R band was obtained in the single \nframes. No credible new source is detected by our online pipeline during \nfollow-up observations. A more detailed image analysis including\nco-addition is ongoing with our offline pipeline to search for transient\ncandidates.",
  "circularId": 25629,
  "createdOn": 1567514573000,
  "email": "nicolas.dagoneau@cea.fr",
  "subject": "LIGO/Virgo S190828l: no counterpart candidate in the SVOM/GWAC observations",
  "submitter": "Nicolas Dagoneau at CEA/IRFU/DAp/SVOM  <nicolas.dagoneau@cea.fr>",
  "eventId": "LIGO/Virgo S190828l"
}