GCN Circular 25847
Subject
LIGO/Virgo S190923y: No significant candidates in TAROT-GRANDMA observations
Date
2019-09-26T01:48:57Z (5 years ago)
From
Damien Turpin at NAOC (CAS) <dturpin-astro@hotmail.com>
D. Turpin (NAOC), P. Hello (LAL), K. Noysena (Artemis, IRAP),
C. Thoene (HETH/IAA-CSIC), M. Boer (Artemis), N. Christensen (Artemis),
L. Eymar (Artemis), A. Klotz (IRAP), S. Antier (APC), S. Basa (LAM),
D. Corre (LAL), M. Coughlin (Caltech), D. Coward (OzGrav-UWA), J.G.
Ducoin (LAL), B. Gendre (OzGrav-UWA), D. A. Kann (HETH/IAA-CSIC),
C. Lachaud (APC), N. Leroy (LAL) report on behalf of the TAROT
network and GRANDMA collaborations:
We performed tiled observations of the LIGO/Virgo S190923y event with the
TAROT-Reunion (TRE), TAROT-Calern (TCA) and TAROT-Chili (TCH) telescopes
operating in the visible located respectively at
Les Makes astronomical observatory, the Cote d'Azur
observatory and La Silla ESO observatory (LaS/ESO).
The observation started on 09/23/19 16:30:12 UTC for TRE which
corresponds approximately to 215 minutes after the
GW trigger time.
For TCA it started on 09/23/19 18:22:31 UTC which corresponds
approximately to 327 minutes after the GW trigger time.
For TCH it started on 09/23/19 23:42:17 UTC which corresponds
approximately to 647 minutes after the GW trigger time.
We performed the following tiled observations :
+-------+------------+------------+---------+---------+---------+
| Tele �| TStart � � | TEnd � � � | RA � � �| DEC � � | � Proba |
| scope | [UTC] � � �| [UTC] � � �| [deg] � | [deg] � | � � [%] |
|-------|------------+------------+---------+---------+---------|
| �TRE �| 2019-09-23 | 2019-09-25 | 250.909 | -40.909 | � � 1.2 |
| � � � | 16:30:12 � | 18:18:14 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 243.243 | -32.727 | � � 1.1 |
| � � � | 16:43:24 � | 16:01:15 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 243.117 | -28.636 | � � 1.1 |
| � � � | 16:55:50 � | 16:13:27 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 245.455 | -40.909 | � � 1 � |
| � � � | 17:08:55 � | 16:26:45 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 285 � � | -73.636 | � � 0.8 |
| � � � | 17:21:15 � | 19:09:01 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 243 � � | -24.545 | � � 0.8 |
| � � � | 17:40:29 � | 16:58:26 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 256.154 | -53.182 | � � 1.6 |
| � � � | 17:56:56 � | 17:33:16 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 249.677 | -45 � � | � � 1.5 |
| � � � | 18:16:07 � | 17:52:26 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 246.857 | -36.818 | � � 1.4 |
| � � � | 18:29:19 � | 18:05:44 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 276 � � | -69.545 | � � 1 � |
| � � � | 19:13:36 � | 21:19:48 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 265.714 | -61.364 | � � 1.2 |
| � � � | 21:05:15 � | 20:41:36 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 270 � � | -65.455 | � � 1.2 |
| � � � | 21:17:59 � | 20:54:39 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 90 � � �| 4.091 � | � � 1.1 |
| � � � | 21:35:17 � | 23:37:06 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-26 | 85.909 �| 0 � � � | � � 1 � |
| � � � | 21:56:18 � | 00:02:43 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 85.909 �| 4.091 � | � � 0.8 |
| � � � | 22:15:29 � | 21:51:45 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-23 | 2019-09-25 | 91.034 �| 8.182 � | � � 1.5 |
| � � � | 23:09:44 � | 22:46:17 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-24 | 2019-09-24 | 248.108 | -32.727 | � � 0.7 |
| � � � | 18:28:15 � | 18:34:32 � | � � � � | � � � � | � � � � |
| �TRE �| 2019-09-24 | 2019-09-25 | 260.425 | -57.273 | � � 1.4 |
| � � � | 19:22:29 � | 20:24:29 � | � � � � | � � � � | � � � � |
|-------|------------+------------+---------+---------+---------|
| �TCA �| 2019-09-23 | 2019-09-25 | 150.95 �| 48.27 � | � � 0.1 |
| � � � | 18:22:31 � | 02:58:48 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-23 | 2019-09-25 | 89.075 �| 11.156 �| � � 0.1 |
| � � � | 23:41:57 � | 03:19:06 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-24 | 81.575 �| -9.256 �| � � 0.1 |
| � � � | 00:27:20 � | 03:03:58 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-24 | 80.112 �| -11.112 | � � 0.1 |
| � � � | 00:40:21 � | 00:46:41 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-26 | 79.7 � �| -9.256 �| � � 0.1 |
| � � � | 00:47:07 � | 00:23:08 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-26 | 92.783 �| 3.733 � | � � 0.1 |
| � � � | 00:53:52 � | 00:29:56 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 146.538 | 46.414 �| � � 0.2 |
| � � � | 01:26:35 � | 02:32:55 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 149.185 | 46.414 �| � � 0.2 |
| � � � | 01:33:22 � | 02:35:21 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 151.832 | 46.414 �| � � 0.2 |
| � � � | 01:40:06 � | 02:46:24 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 148.223 | 48.27 � | � � 0.1 |
| � � � | 01:59:17 � | 03:05:36 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 145.495 | 48.27 � | � � 0.1 |
| � � � | 02:06:01 � | 03:12:21 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-24 | 142.768 | 48.27 � | � � 0.1 |
| � � � | 02:18:25 � | 02:24:45 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 153.677 | 48.27 � | � � 0.1 |
| � � � | 02:25:12 � | 18:31:12 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 156.405 | 48.27 � | � � 0.1 |
| � � � | 02:31:57 � | 18:38:00 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 83.022 �| -7.401 �| � � 0.1 |
| � � � | 02:38:42 � | 01:14:45 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 159.132 | 48.27 � | � � 0.1 |
| � � � | 02:50:52 � | 18:57:10 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 147.433 | 42.703 �| � � 0.1 |
| � � � | 03:04:26 � | 04:08:35 � | � � � � | � � � � | � � � � |
| �TCA �| 2019-09-24 | 2019-09-25 | 161.859 | 48.27 � | � � 0.1 |
| � � � | 03:30:18 � | 02:06:41 � | � � � � | � � � � | � � � � |
|-------+------------+------------+---------+---------+---------+
| �TCH �| 2019-09-23 | 2019-09-25 | 261.239 | -54.505 | � � 0.2 |
| � � � | 23:42:17 � | 03:18:23 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 251.119 | -52.686 | � � 0.2 |
| � � � | 00:03:52 � | 23:38:03 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 243.214 | -36.323 | � � 0.2 |
| � � � | 00:08:26 � | 23:44:47 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-26 | 265.656 | -69.05 �| � � 0.1 |
| � � � | 00:34:28 � | 00:10:43 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 239.646 | -21.777 | � � 0.2 |
| � � � | 02:05:45 � | 00:41:50 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 239.014 | -19.959 | � � 0.2 |
| � � � | 02:24:51 � | 01:01:21 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 285.466 | -70.868 | � � 0.2 |
| � � � | 02:50:54 � | 23:57:11 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-26 | 296.15 �| -74.505 | � � 0.1 |
| � � � | 03:29:45 � | 00:36:07 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 265.656 | -58.141 | � � 0.2 |
| � � � | 05:14:24 � | 06:20:43 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 93.211 �| 5.495 � | � � 0.2 |
| � � � | 05:53:19 � | 06:59:50 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 92.787 �| 10.95 � | � � 0.4 |
| � � � | 06:26:33 � | 07:32:51 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 94.624 �| 10.95 � | � � 0.4 |
| � � � | 06:33:19 � | 07:39:36 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 90.95 � | 10.95 � | � � 0.3 |
| � � � | 06:40:04 � | 07:46:20 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 94.148 �| 9.132 � | � � 0.3 |
| � � � | 06:46:48 � | 07:53:05 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 96.46 � | 10.95 � | � � 0.2 |
| � � � | 07:01:09 � | 08:05:28 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-24 | 2019-09-25 | 94.07 � | 7.314 � | � � 0.2 |
| � � � | 07:18:38 � | 08:24:58 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-25 | 2019-09-26 | 239.793 | -27.707 | � � 0.2 |
| � � � | 01:27:40 � | 00:03:57 � | � � � � | � � � � | � � � � |
| �TCH �| 2019-09-25 | 2019-09-25 | 242.134 | -21.777 | � � 0.1 |
| � � � | 01:46:49 � | 01:53:08 � | � � � � | � � � � | � � � � |
|-------+------------+------------+---------+---------+---------+
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 TRE tile is 4.2x4.2 degrees and 1.9x1.9 degrees for TCA and TCH.
These observations cover about 25.5% the cumulative probability of the
Bayestar skymap available on Sep 23, 2019 13:01:56 UTC.
The typical limiting magnitude is 17.0 and 18.0 for a 60.0 s exposure
for TRE and TCA/TCH, respectively.
The coverage map is available at:
https://grandma-owncloud.lal.in2p3.fr/index.php/s/Y2sXYjRmkubuRrw
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 TRE, TCA and TCH telescopes are available on the GRANDMA
web pages or on �http://tarot.obs-hp.fr/.
This circular is citable.