GCN Circular 25781
Subject
LIGO/Virgo S190915ak: No significant candidates in TAROT-GRANDMA observations
Date
2019-09-19T14:22:52Z (5 years ago)
From
Alexander Kann at IAA-CSIC <kann@iaa.es>
D. A. Kann (HETH/IAA-CSIC), A. Simon (ASPD TSNUK), Z. Vidadi (Shao), S.
Antier (APC), M. Boer (Artemis), N. Christensen (Artemis), L. Eymar
(Artemis), A. Klotz (IRAP), S. Alishov (SHAO), K. Barynova (Kyiv Univ),
D. Coward (OzGrav-UWA), K. Noysena (Artemis, IRAP), S. Basa (LAM), D.
Corre (LAL), M. Coughlin (Caltech), J.G. Ducoin (LAL), B. Gendre
(OzGrav-UWA), P. Hello (LAL), C. Lachaud (APC), N. Leroy (LAL), D.
Turpin (NAOC) and X. Wang (THU)
report on behalf of the TAROT network and GRANDMA collaborations:
We performed tiled observations of LIGO/Virgo S190915ak event (GCN
#25753) with the TAROT-Calern (TCA) telescope operating in the visible
located at Calern site at the Cote d'Azur observatory. The observation
started on 09/16/19 00:12:27 UTC which corresponds approximately to 16
minutes after the GW trigger time.
We performed the following tiled observations :
+------------+------------+---------+---------+---------+
| TStart | TEnd | RA | DEC | Proba |
| [UTC] | [UTC] | [deg] | [deg] | [%] |
|------------+------------+---------+---------+---------|
| 2019-09-16 | 2019-09-16 | 195.545 | 68.682 | 1.0 |
| 00:12:27 | 23:06:42 | | | |
| 2019-09-16 | 2019-09-16 | 187.785 | 66.826 | 0.7 |
| 00:19:13 | 23:13:29 | | | |
| 2019-09-16 | 2019-09-18 | 190.68 | 68.682 | 1.1 |
| 00:54:58 | 01:52:26 | | | |
| 2019-09-16 | 2019-09-17 | 185.815 | 68.682 | 0.5 |
| 01:20:35 | 01:17:26 | | | |
| 2019-09-16 | 2019-09-18 | 192.342 | 66.826 | 1.6 |
| 01:27:23 | 03:10:13 | | | |
| 2019-09-16 | 2019-09-16 | 186.244 | 70.538 | 0.4 |
| 01:34:07 | 22:57:41 | | | |
| 2019-09-16 | 2019-09-17 | 191.538 | 70.538 | 0.8 |
| 02:51:43 | 01:10:45 | | | |
| 2019-09-16 | 2019-09-17 | 168.392 | 77.96 | 0.2 |
| 23:58:22 | 00:04:42 | | | |
| 2019-09-17 | 2019-09-18 | 195.774 | 64.971 | 1.9 |
| 00:05:13 | 02:57:21 | | | |
| 2019-09-17 | 2019-09-17 | 161.664 | 74.249 | 0.1 |
| 00:17:49 | 02:54:26 | | | |
| 2019-09-17 | 2019-09-17 | 196.899 | 66.826 | 1.3 |
| 00:24:37 | 21:01:18 | | | |
| 2019-09-17 | 2019-09-17 | 191.538 | 64.971 | 1.5 |
| 02:15:22 | 20:54:35 | | | |
| 2019-09-17 | 2019-09-17 | 180.95 | 68.682 | 0.4 |
| 02:41:18 | 02:47:37 | | | |
| 2019-09-17 | 2019-09-17 | 196.541 | 50.125 | 5.3 |
| 19:19:28 | 21:40:15 | | | |
| 2019-09-17 | 2019-09-17 | 195.704 | 51.981 | 4.9 |
| 19:30:30 | 19:34:40 | | | |
| 2019-09-17 | 2019-09-17 | 193.706 | 50.125 | 2.1 |
| 20:16:20 | 20:22:40 | | | |
| 2019-09-17 | 2019-09-17 | 196.832 | 46.414 | 1.7 |
| 20:28:50 | 20:35:09 | | | |
| 2019-09-17 | 2019-09-17 | 194.796 | 63.115 | 1.5 |
| 20:41:28 | 20:47:47 | | | |
| 2019-09-17 | 2019-09-17 | 197.021 | 55.692 | 1.3 |
| 21:01:43 | 21:08:03 | | | |
| 2019-09-17 | 2019-09-17 | 192.753 | 51.981 | 1.1 |
| 21:13:51 | 21:20:10 | | | |
| 2019-09-17 | 2019-09-17 | 200.95 | 53.837 | 1.1 |
| 21:20:24 | 21:26:44 | | | |
| 2019-09-17 | 2019-09-17 | 198.655 | 51.981 | 4.2 |
| 21:46:35 | 21:52:54 | | | |
| 2019-09-17 | 2019-09-17 | 197.873 | 53.837 | 3.3 |
| 21:53:19 | 21:59:38 | | | |
+------------+------------+---------+---------+---------+
TStart and TEnd refers respectively to the time of the first and last
exposure for a given tile. Observations are not necessarily continuous
in this interval.
The Probability refers to the 2D spatial probability of the GW skymap
enclosed in a given tile. Each tile is 1.9x1.9 degrees. These
observations cover about 36% the cumulative probability of the
LALInference skymap available on Sep 17, 2019 14:16:39 UTC.
The typical limiting magnitude is 18.0 for a 60.0 s exposure.
The coverage map is available at:
https://grandma-owncloud.lal.in2p3.fr/index.php/s/55vKDfmLJzbHyBn
No significant transient candidates were found during our low latency
analysis.
GRANDMA (Global Rapid Advanced Network Devoted to the Multi-messenger
Addicts) is a network of robotic telescopes connected all over the world
with both photometry and spectroscopy capabilities for Time-domain
Astronomy (https://grandma.lal.in2p3.fr/). Details on the TCA telescope
are available on the GRANDMA web pages or on http://tarot.obs-hp.fr/.