{
  "bibcode": "2020GCN.27169....1D",
  "body": "J.-G. Ducoin(IJCLab), X. G. Wang (GXU), N. Leroy (CNRS/LAL), \nJ. R. Mao (YNAO), S. S. Sun (GXU)\n\nreport on behalf of the SVOM Multi Messenger Astronomy and GWAC teams\n(http://www.svom.fr/en/svom-mma-and-gwac-team):\n\nWe observed 13 (~1950 square deg) sky regions to cover the skymap of the\nadvanced LIGO/Virgo trigger S200219ac  (GCN # 27130), with SVOM/GWAC,\nat Xinglong Observatory. SVOM/GWAC is equipped with two sets of\nwide angle cameras:\n- FFOV cameras (FOV~900 square degrees/camera, aperture = 3.5 cm),\n- JFOV cameras (FOV~150 square degrees/camera, aperture = 18 cm).\n\nSVOM/GWAC currently comprises 4 FFOV cameras and 16 JFOV cameras,\nworking in the unfiltered band. The observations are operated in\ntime-series mode, taking one exposure every 25 seconds\n(20s exposure + 5s readout). The observed and processed regions enclosed\nan estimated 42.7% of the probability of the advanced LIGO/Virgo skymap.\nImages were taken between ~3 hours and ~8 hours\nafter the GW trigger time. The coordinates of the 13 sky regions\nobserved and their observation times and covered probability are\nlisted below:\n\n\nId Ra          Dec      start (UTC)         end (UTC)          Proba. Cam.\n1  10:18:57.60 31:33:11 2020-02-19 12:30:12 2020-02-19 12:58:20 0.002 JFOV\n2  11:10:06.00 19:17:33 2020-02-19 12:30:12 2020-02-19 12:58:20 0.024 JFOV\n3  10:21:27.60 19:30:50 2020-02-19 12:30:12 2020-02-19 12:58:20 0.009 JFOV\n4  11:00:30.00 18:22:24 2020-02-19 12:01:13 2020-02-19 12:29:28 0.024 JFOV\n5  11:15:24.24 35:32:37 2020-02-19 12:30:20 2020-02-19 13:30:58 0.114 JFOV\n6  11:34:14.64 31:33:03 2020-02-19 13:32:46 2020-02-19 14:00:55 0.106 JFOV\n7  11:36:40.32 19:31:06 2020-02-19 13:32:46 2020-02-19 14:00:55 0.008 JFOV\n8  11:51:46.80 48:34:54 2020-02-19 14:03:35 2020-02-19 15:03:39 0.096 JFOV\n9  11:57:32.16 36:34:18 2020-02-19 14:03:35 2020-02-19 15:03:39 0.090 JFOV\n10 12:54:39.12 52:06:30 2020-02-19 13:41:16 2020-02-19 14:42:13 0.115 JFOV\n11 13:34:29.04 65:10:48 2020-02-19 15:45:36 2020-02-19 17:19:54 0.058 JFOV\n12 13:49:30.96 53:16:58 2020-02-19 15:44:30 2020-02-19 17:19:54 0.007 JFOV\n13 15:15:08.40 68:44:16 2020-02-19 15:49:58 2020-02-19 16:46:14 0.010 JFOV\n\n\n\nThe sky coverage map is available at:\nhttp://cmm.svom.cn/gwpub/O3/S200219ac/S200219ac.png\n(user:svomo3 pwd:gwo3).\n\nWeather conditions were clear during the observations. An average 3-sigma\nlimiting magnitude of 16 mag in the R band was obtained in the single\nframes. No credible new source was 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": 27169,
  "createdOn": 1582476580000,
  "email": "ducoin@lal.in2p3.fr",
  "subject": "LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC observations",
  "submitter": "Jean-Gregoire Ducoin at LAL  <ducoin@lal.in2p3.fr>",
  "eventId": "LIGO/Virgo S200219ac"
}