GCN Circular 27170

J.-G. Ducoin(IJCLab), X. G. Wang (GXU), N. Leroy (IJCLab), 
J. R. Mao (YNAO), S. S. Sun (GXU)

report on behalf of the SVOM Multi Messenger Astronomy and GWAC teams
(http://www.svom.fr/en/svom-mma-and-gwac-team):


We observed 49 sky regions to cover the initial skymap of the 
LIGO/Virgo trigger S200219ac (GCN # 27130), with the SVOM/GWAC-F30 
telescope operated by Huaibei Normal University and NAOC, CAS 
at Xinglong Observatory, China. 
The SVOM/GWAC-F30 is equipped with Standard Johnson filters
and 4Kx4K FLI CCD (FOV~1.8x1.8 degree). The GWAC-F30 is using
tiling observation strategy. The tiles are calculated to cover
the most probable regions of the 90% localization area given in the
GW probability skymap. 5 images with a single exposure of 70s
time in R band are taken for each tile. The typical limiting magnitude
of our image is 17 mag in the R band calibrated to USNO B1.0 R2.
The 49 tile coordinates and the observation periods are listed below:


Id    Ra        Dec     start (UTC)           end (UTC)             Proba.
1  12:34:24.9 +55:24:20 2020-02-19 12:28:28.8 2020-02-19 13:47:43.6 0.010
2  11:36:46.7 +30:25:48 2020-02-19 13:56:11.9 2020-02-19 14:02:11.4 0.003
3  12:46:06.2 +55:24:14 2020-02-19 13:49:44.7 2020-02-19 13:54:30.6 0.009
4  11:28:40.5 +33:07:23 2020-02-19 14:58:19.7 2020-02-19 15:04:15.0 0.006
5  11:33:55.8 +34:49:07 2020-02-19 14:44:14.0 2020-02-19 14:50:09.3 0.006
6  11:36:49.6 +30:26:29 2020-02-19 14:20:45.9 2020-02-19 14:26:39.3 0.003
7  11:37:10.4 +55:57:27 2020-02-19 14:51:33.9 2020-02-19 14:56:47.2 0.000
8  12:22:43.0 +55:24:12 2020-02-19 14:28:44.7 2020-02-19 14:35:09.6 0.007
9  12:27:07.8 +53:41:48 2020-02-19 14:12:38.7 2020-02-19 14:19:03.7 0.009
10 12:43:01.0 +57:05:13 2020-02-19 14:04:12.0 2020-02-19 14:10:32.9 0.007
11 12:49:37.7 +53:41:05 2020-02-19 14:36:51.9 2020-02-19 14:42:29.6 0.008
12 11:24:08.0 +31:26:19 2020-02-19 15:46:32.4 2020-02-19 15:51:38.1 0.006
13 11:25:42.6 +34:49:40 2020-02-19 15:12:18.1 2020-02-19 15:17:17.4 0.006
14 11:31:40.5 +36:31:26 2020-02-19 15:05:39.4 2020-02-19 15:10:32.8 0.006
15 11:38:28.8 +38:13:57 2020-02-19 15:39:54.2 2020-02-19 15:45:01.7 0.006
16 11:40:00.8 +36:32:08 2020-02-19 15:53:29.0 2020-02-19 15:58:33.5 0.006
17 12:21:13.8 +51:48:38 2020-02-19 15:19:17.6 2020-02-19 15:24:17.0 0.006
18 12:50:36.6 +62:00:08 2020-02-19 15:26:07.1 2020-02-19 15:31:12.0 0.006
19 13:04:44.7 +61:59:58 2020-02-19 15:32:57.4 2020-02-19 15:37:56.9 0.006
20 11:20:32.9 +33:08:45 2020-02-19 16:14:04.3 2020-02-19 16:19:05.9 0.006
21 11:29:49.9 +38:14:53 2020-02-19 16:34:53.3 2020-02-19 16:39:54.4 0.005
22 11:36:37.8 +33:08:44 2020-02-19 16:28:04.3 2020-02-19 16:33:08.7 0.005
23 11:37:21.5 +39:56:53 2020-02-19 16:41:22.1 2020-02-19 16:46:26.8 0.005
24 12:15:54.9 +53:32:34 2020-02-19 16:48:18.2 2020-02-19 16:53:20.2 0.006
25 12:40:18.4 +58:38:27 2020-02-19 16:55:19.0 2020-02-19 17:00:25.6 0.005
26 12:42:46.0 +51:49:31 2020-02-19 16:20:51.0 2020-02-19 16:25:56.8 0.006
27 12:55:21.0 +56:54:48 2020-02-19 16:00:25.9 2020-02-19 16:05:25.8 0.005
28 12:57:54.9 +55:12:56 2020-02-19 16:07:06.3 2020-02-19 16:12:09.0 0.005
29 11:23:02.2 +36:33:40 2020-02-19 17:58:39.8 2020-02-19 18:03:45.8 0.005
30 11:31:58.5 +31:27:11 2020-02-19 17:02:15.8 2020-02-19 17:07:17.5 0.005
31 11:41:56.8 +34:51:32 2020-02-19 17:37:04.6 2020-02-19 17:42:11.3 0.004
32 11:45:53.7 +41:39:02 2020-02-19 17:08:59.7 2020-02-19 17:14:08.0 0.005
33 11:46:04.7 +39:57:07 2020-02-19 17:16:13.7 2020-02-19 17:21:20.1 0.005
34 11:46:14.2 +43:21:28 2020-02-19 17:44:12.3 2020-02-19 17:49:17.3 0.004
35 12:49:49.3 +63:45:08 2020-02-19 17:23:14.2 2020-02-19 17:28:21.0 0.005
36 12:51:19.0 +60:21:29 2020-02-19 17:51:25.9 2020-02-19 17:56:30.9 0.005
37 13:04:46.4 +63:45:05 2020-02-19 17:30:16.0 2020-02-19 17:35:17.2 0.004
38 11:16:00.3 +31:27:07 2020-02-19 18:33:56.2 2020-02-19 18:39:03.9 0.005
39 11:46:49.8 +38:15:31 2020-02-19 18:05:27.3 2020-02-19 18:10:34.6 0.004
40 11:55:26.3 +43:21:34 2020-02-19 18:12:31.4 2020-02-19 18:17:41.8 0.004
41 12:15:50.0 +50:09:45 2020-02-19 18:19:52.3 2020-02-19 18:25:00.3 0.005
42 12:52:50.3 +58:39:49 2020-02-19 18:27:04.6 2020-02-19 18:32:06.9 0.004
43 11:17:04.2 +34:50:41 2020-02-19 19:36:36.2 2020-02-19 19:41:42.0 0.004
44 11:36:35.4 +41:39:15 2020-02-19 19:22:28.5 2020-02-19 19:27:36.9 0.004
45 11:54:34.7 +41:39:16 2020-02-19 19:29:42.3 2020-02-19 19:34:52.2 0.004
46 11:56:38.1 +45:03:23 2020-02-19 19:01:51.7 2020-02-19 19:06:53.4 0.004
47 12:18:00.9 +56:57:17 2020-02-19 19:51:06.9 2020-02-19 19:56:11.4 0.004
48 12:26:10.1 +50:09:41 2020-02-19 19:08:35.7 2020-02-19 19:13:39.8 0.005
49 13:04:29.7 +60:21:41 2020-02-19 19:15:28.4 2020-02-19 19:20:33.1 0.005

The covering map is available at:
http://cmm.svom.cn/gwpub/O3/S200219ac/S200219ac_F30.png
(user:svomo3 pwd:gwo3)

The first image was taken ~3 hours after the event trigger time. 
No credible new source is detected by our online pipeline.
A more detailed image analysis is in progress with our offline pipeline
to search for any fainter transient candidate.