{
  "subject": "LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC-F30 observations",
  "eventId": "LIGO/Virgo S200316bj",
  "bibcode": "2020GCN.27421....1W",
  "createdOn": 1584974790000,
  "circularId": 27421,
  "submitter": "Nicolas Dagoneau at CEA/IRFU/DAp/SVOM  <nicolas.dagoneau@cea.fr>",
  "email": "nicolas.dagoneau@cea.fr",
  "body": "J. Wang (GXU),  N. Dagoneau (CEA/AIM), J. Y. Wei (NAOC), S. Schanne (CEA/AIM),\nX. H. Han (NAOC), L. P. Xin (NAOC)\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 22 sky regions to cover the initial skymap of the LIGO/Virgo\ntrigger S200316bj (GCN # 27388), with the SVOM/GWAC-F30 telescope operated\nby Huaibei Normal University and NAOC, CAS at Xinglong Observatory, China. \n\nThe SVOM/GWAC-F30 is equipped with Standard Johnson filters and 4Kx4K FLI\nCCD (FOV~1.8x1.8 degree). The GWAC-F30 is using tiling observation\nstrategy. The tiles are calculated to cover the most probable regions of\nthe 90% localization area given in the GW probability skymap. 5 images\nwith a single exposure of 70s time in R band are taken for each tile. The\ntypical limiting magnitude of our image is 17 mag in the R band calibrated\nto USNO B1.0 R2. The images of GWAC-F30 cover 31.7% of skymap.\n\nThe 22 tile coordinates and the observation periods are listed below:\n\nId Ra          Dec         start (UTC)         end (UTC)           Proba.\n0  05:46:52.80 46:45:00.00 2020-03-17 11:25:07 2020-03-17 11:31:54 0.054\n1  05:47:55.20 48:27:00.00 2020-03-17 15:28:44 2020-03-17 15:40:26 0.044\n2  05:56:38.40 46:45:00.00 2020-03-17 14:01:28 2020-03-17 14:14:58 0.034\n3  05:37:50.40 48:27:00.00 2020-03-17 12:51:40 2020-03-17 13:04:56 0.029\n4  05:46:12.00 45:02:60.00 2020-03-17 12:08:45 2020-03-17 12:22:03 0.034\n5  05:58:00.00 48:27:00.00 2020-03-17 13:19:43 2020-03-17 13:32:50 0.024\n6  05:37:07.20 46:45:00.00 2020-03-17 15:40:44 2020-03-17 15:55:06 0.028\n7  05:49:19.20 50:08:60.00 2020-03-17 15:00:34 2020-03-17 15:14:23 0.020\n8  05:38:55.20 50:08:60.00 2020-03-17 12:23:13 2020-03-17 12:36:36 0.017\n9  05:55:40.80 45:02:60.00 2020-03-17 11:25:07 2020-03-17 11:38:59 0.025\n10 05:59:45.60 50:08:60.00 2020-03-17 11:39:31 2020-03-17 11:52:53 0.010\n11 05:36:43.20 45:02:60.00 2020-03-17 13:06:07 2020-03-17 13:19:17 0.016\n12 06:06:26.40 46:45:00.00 2020-03-17 15:55:34 2020-03-17 16:00:11 0.011\n13 06:08:04.80 48:27:00.00 2020-03-17 15:15:32 2020-03-17 15:28:32 0.009\n14 04:39:48.00 45:02:60.00 2020-03-17 13:33:54 2020-03-17 13:47:11 0.008\n15 05:45:52.80 43:21:00.00 2020-03-17 11:53:55 2020-03-17 12:07:30 0.011\n16 05:55:04.80 43:21:00.00 2020-03-17 12:36:58 2020-03-17 12:50:27 0.010\n17 05:40:21.60 51:51:00.00 2020-03-17 13:47:28 2020-03-17 14:01:03 0.005\n18 05:27:45.60 48:27:00.00 2020-03-17 16:00:20 2020-03-17 16:15:05 0.008\n19 05:51:09.60 51:51:00.00 2020-03-17 14:16:16 2020-03-17 14:29:29 0.005\n20 06:05:09.60 45:02:60.00 2020-03-17 14:30:36 2020-03-17 14:43:53 0.008\n21 06:10:12.00 50:08:60.00 2020-03-17 16:15:45 2020-03-17 16:20:09 0.004\n\nThe covering map is available at:\nhttp://cmm.svom.cn/gwpub/O3/S200316bj/S200316bj_F30.png\n(user:svomo3 pwd:gwo3)\n\nThe first image was taken ~11.5 hours after the event trigger time. No\ncredible new source is detected by our online pipeline. A more detailed\nimage analysis is in progress with our offline pipeline to search for any\nfainter transient candidate."
}