[vsnet-grb-info 24472] LIGO/Virgo S191222n: no counterpart candidate in SVOM/GWAC observations

GCN Circulars gcncirc at capella2.gsfc.nasa.gov
Tue Dec 24 11:43:40 JST 2019


TITLE:   GCN CIRCULAR
NUMBER:  26571
SUBJECT: LIGO/Virgo S191222n: no counterpart candidate in SVOM/GWAC observations
DATE:    19/12/24 02:40:16 GMT
FROM:    Xuhui Han at NAOC/SVOM  <hxh at nao.cas.cn>

C. Wu (NAOC), M. Dennefeld (IAP/CNRS/SU) , X. Wang (GXU), 
R. Duque (CNRS/IAP), 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 <http://www.svom.fr/en/svom-mma-and-gwac-team>):

We observed  37 150-sq. deg sky regions to cover the skymap of the
advanced LIGO/Virgo trigger S191222n  (GCN # 26543), with SVOM/GWAC,
at Xinglong Observatory. SVOM/GWAC is equipped with two sets of
wide angle cameras:
- FFOV cameras (FOV~900 square degrees/camera, aperture = 3.5 cm),
- JFOV cameras (FOV~150 square degrees/camera, aperture = 18 cm).

SVOM/GWAC currently comprises 4 FFOV cameras and 16 JFOV cameras,
working in the unfiltered band. The observations are operated in
time-series mode, taking one exposure every 25 seconds
(20s exposure + 5s readout). The observed and processed regions enclosed
an estimated 36.9% of the probability of the advanced LIGO/Virgo skymap.
Images were taken between ~8.8 minutes and ~16.63 hours after the GW trigger
time. The coordinates of the 37 sky regions observed after the trigger and
their observation times and covered probability are listed below:

Id Ra           Dec         start (UTC)       end (UTC)         Cov. Cam.
1   07:24:00.24 53:02:52.80    2019-12-22 12:32:11 2019-12-22 12:59:41    0.021   JFOV
2   05:50:52.75 52:05:58.20    2019-12-22 12:17:05 2019-12-22 12:23:10    0.029   JFOV
3   07:30:30.00 48:26:49.56    2019-12-22 13:37:33 2019-12-22 14:39:54    0.017   JFOV
4   08:31:26.64 36:09:36.36    2019-12-22 13:41:12 2019-12-22 14:39:54    0.001   JFOV
5   08:26:42.72 47:40:49.80    2019-12-22 13:28:55 2019-12-22 13:49:59    0.017   JFOV
6   08:57:33.12 48:28:44.40    2019-12-22 14:40:49 2019-12-22 15:08:43    0.014   JFOV
7   09:58:28.80 36:10:45.48    2019-12-22 14:40:49 2019-12-22 15:08:44    0.010   JFOV
8   09:03:17.76 36:28:34.68    2019-12-22 14:40:49 2019-12-22 15:08:44    0.005   JFOV
9   09:53:40.32 47:42:14.40    2019-12-22 14:56:46 2019-12-22 15:41:54    0.004   JFOV
10  08:46:46.08 35:05:22.92    2019-12-22 14:41:22 2019-12-22 15:41:54    0.001   JFOV
11  11:07:09.36 14:33:39.96    2019-12-22 17:28:48 2019-12-22 17:56:42    0.008   JFOV
12  11:52:22.32 02:14:49.49    2019-12-22 17:28:48 2019-12-22 17:56:43    0.024   JFOV
13  11:43:29.28 13:47:45.24    2019-12-22 17:28:23 2019-12-22 17:56:20    0.011   JFOV
14  11:43:07.44 01:33:46.40    2019-12-22 17:28:23 2019-12-22 17:55:56    0.017   JFOV
15  13:05:04.80 -14:43:42.60   2019-12-22 19:55:37 2019-12-22 20:13:24    0.059   JFOV
16  12:19:09.84 -14:28:44.04   2019-12-22 19:45:30 2019-12-22 20:13:24    0.029   JFOV
17  12:54:54.96 -3:11:46.03    2019-12-22 19:45:37 2019-12-22 20:13:35    0.015   JFOV
18  01:16:50.26 13:21:14.40    2019-12-22 10:55:10 2019-12-22 10:56:23    0.002   JFOV
19  01:31:43.61 -2:38:38.15    2019-12-22 12:00:30 2019-12-22 12:28:24    0.011   JFOV
20  01:31:11.11 -14:41:56.76   2019-12-22 12:00:30 2019-12-22 12:28:25    0.003   JFOV
21  01:15:33.36 -15:41:16.80   2019-12-22 12:32:50 2019-12-22 13:00:47    0.002   JFOV
22  02:22:18.02 19:03:32.04    2019-12-22 11:36:09 2019-12-22 11:56:47    0.039   JFOV
23  01:35:19.34 19:18:38.16    2019-12-22 11:51:07 2019-12-22 11:56:47    0.004   JFOV
24  01:20:10.46 18:12:47.16    2019-12-22 11:34:30 2019-12-22 11:57:11    0.001   JFOV
25  02:48:12.86 31:22:33.96    2019-12-22 10:12:47 2019-12-22 10:39:04    0.047   JFOV
26  03:43:25.08 30:52:54.84    2019-12-22 10:26:10 2019-12-22 10:28:04    0.012   JFOV
27  02:50:44.57 19:20:33.36    2019-12-22 10:19:15 2019-12-22 10:39:04    0.021   JFOV
28  02:33:21.58 30:19:24.96    2019-12-22 10:10:30 2019-12-22 10:38:27    0.037   JFOV
29  03:28:18.70 18:23:05.64    2019-12-22 10:16:10 2019-12-22 10:38:27    0.022   JFOV
30  02:35:25.70 18:14:51.72    2019-12-22 10:11:43 2019-12-22 10:38:27    0.032   JFOV
31  05:29:11.35 53:00:20.88    2019-12-22 13:03:21 2019-12-22 13:31:15    0.032   JFOV
32  04:15:03.79 53:17:51.36    2019-12-22 13:03:45 2019-12-22 13:23:58    0.019   JFOV
33  04:36:43.78 48:22:15.60    2019-12-22 11:11:19 2019-12-22 11:25:29    0.039   JFOV
34  04:42:32.40 36:22:20.28    2019-12-22 11:14:09 2019-12-22 11:20:13    0.002   JFOV
35  04:20:09.24 47:15:37.80    2019-12-22 11:16:02 2019-12-22 11:27:22    0.042   JFOV
36  05:32:53.42 47:36:12.96    2019-12-22 11:10:51 2019-12-22 11:25:51    0.024   JFOV
37  04:26:06.91 35:13:31.80    2019-12-22 10:57:54 2019-12-22 11:24:14    0.003   JFOV


The sky coverage map is available at:
http://cmm.svom.cn/gwpub/O3/S191222n/S191222n.png <http://cmm.svom.cn/gwpub/O3/S191222n/S191222n.png>
(user:svomo3 pwd:gwo3).

Weather conditions were clear during the observations. An average 3-sigma
limiting magnitude of 16 mag in the R band was obtained in the single
frames. No credible new source was detected by our online pipeline during
follow-up observations. A more detailed image analysis including
co-addition is ongoing with our offline pipeline to search for transient
candidates.



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