[vsnet-grb-info 23495] LIGO/Virgo S190828j : No significant candidates in TAROT-GRANDMA observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Sep 1 06:25:12 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 25594
SUBJECT: LIGO/Virgo S190828j : No significant candidates in TAROT-GRANDMA observations
DATE: 19/08/31 21:23:06 GMT
FROM: Nelson Christensen at Obs.de la Cote dAzur,Nice <nelson.christensen at oca.eu>
S. Antier (APC), C. Lachaud (APC), N. Christensen (Artemis), B. Gendre
(OzGrav-UWA), N. Ismayilov (SHAO), M. Boer (Artemis), L. Eymar
(Artemis), A. Klotz (IRAP), K. Noysen (Artemis, IRAP), S. Basa (LAM), D.
Corre (LAL), M. Coughlin (Caltech), D. Coward (OzGrav-UWA), J.G. Ducoin
(LAL), P. Hello (LAL), N. Leroy (LAL), D. Turpin (NAOC), X. Wang (THU)
report on behalf of the TAROT network and GRANDMA collaborations.
We performed tiled observations of the LIGO/Virgo event S190828j with
the TAROT-Chili (TCH), TAROT-Calern (TCA) and TAROT-Reunion (TRE)
telescopes operating in the visible located respectively at La Silla
ESO observatory (LaS/ESO), the Calern site at the Cote d'Azur
Observatory and Les Makes astronomical observatory.
The observation started for TCH on 08/28/19 07:05:39 UTC which
corresponds approximately to 32 minutes after the GW trigger time.
We performed the following tiled observations :
+-------+------------+------------+---------+---------+---------+
| Tele | TStart | TEnd | RA | DEC | Proba |
| scope | [UTC] | [UTC] | [deg] | [deg] | [%] |
|-------+------------+------------+---------+---------+---------|
| TCH | 2019-08-28 | 2019-08-30 | 312.95 | 12.768 | 0.1 |
| | 07:05:39 | 03:48:14 | | | |
| TCH | 2019-08-28 | 2019-08-30 | 309.933 | 9.05 | 0.1 |
| | 07:34:47 | 03:55:02 | | | |
| TCH | 2019-08-29 | 2019-08-30 | 314.525 | 27.707 | 0.1 |
| | 00:24:53 | 01:31:01 | | | |
| TCH | 2019-08-29 | 2019-08-30 | 319.388 | 21.777 | <0.1 |
| | 03:00:41 | 06:37:09 | | | |
| TCH | 2019-08-29 | 2019-08-30 | 314.558 | 13.161 | <0.1 |
| | 03:07:29 | 06:43:58 | | | |
| TCH | 2019-08-30 | 2019-08-30 | 213.626 | -61.777 | 0.2 |
| | 03:34:54 | 03:41:24 | | | |
|-------+------------+------------+---------+---------+---------|
| TCA | 2019-08-28 | 2019-08-28 | 330.312 | 44.558 | 1.1 |
| | 19:04:46 | 19:11:17 | | | |
| TCA | 2019-08-28 | 2019-08-29 | 331.832 | 46.414 | 0.9 |
| | 19:11:36 | 20:17:45 | | | |
| TCA | 2019-08-28 | 2019-08-30 | 328.674 | 42.703 | 0.8 |
| | 19:18:25 | 01:24:18 | | | |
| TCA | 2019-08-28 | 2019-08-28 | 8.45 | 61.259 | 0.7 |
| | 19:50:08 | 19:56:38 | | | |
| TCA | 2019-08-28 | 2019-08-29 | 334.479 | 46.414 | 0.7 |
| | 19:56:57 | 01:03:10 | | | |
| TCA | 2019-08-28 | 2019-08-29 | 343.245 | 51.981 | 0.6 |
| | 20:03:48 | 21:09:42 | | | |
| TCA | 2019-08-28 | 2019-08-29 | 324.708 | 39.897 | 0.5 |
| | 20:54:56 | 19:32:34 | | | |
| TCA | 2019-08-28 | 2019-08-29 | 12.818 | 63.115 | 0.5 |
| | 21:01:45 | 02:08:44 | | | |
| TCA | 2019-08-28 | 2019-08-28 | 342.488 | 53.837 | 0.4 |
| | 21:08:35 | 21:15:05 | | | |
| TCA | 2019-08-28 | 2019-08-30 | 12.2 | 61.259 | 0.8 |
| | 22:00:42 | 01:37:59 | | | |
| TCA | 2019-08-28 | 2019-08-29 | 327.125 | 40.372 | 0.8 |
| | 22:07:32 | 23:14:25 | | | |
| TCA | 2019-08-28 | 2019-08-28 | 331.157 | 42.703 | 0.7 |
| | 22:14:21 | 22:20:50 | | | |
| TCA | 2019-08-28 | 2019-08-28 | 336.404 | 48.27 | 0.5 |
| | 22:59:06 | 23:05:36 | | | |
| TCA | 2019-08-28 | 2019-08-29 | 333.677 | 48.27 | 0.5 |
| | 23:05:56 | 19:12:05 | | | |
| TCA | 2019-08-28 | 2019-08-29 | 329.541 | 40.847 | 0.5 |
| | 23:12:46 | 19:18:54 | | | |
| TCA | 2019-08-28 | 2019-08-29 | 341.108 | 50.125 | 0.5 |
| | 23:19:36 | 19:25:44 | | | |
| TCA | 2019-08-29 | 2019-08-30 | 332.865 | 44.558 | 0.8 |
| | 00:24:58 | 01:31:08 | | | |
| TCA | 2019-08-29 | 2019-08-30 | 345.565 | 53.837 | 0.6 |
| | 01:10:19 | 02:16:27 | | | |
| TCA | 2019-08-29 | 2019-08-30 | 338.273 | 50.125 | 0.6 |
| | 01:17:10 | 02:23:17 | | | |
|-------+------------+------------+---------+---------+---------|
| TRE | 2019-08-28 | 2019-08-28 | 324 | 36.818 | 3.6 |
| | 21:35:08 | 21:41:42 | | | |
| TRE | 2019-08-28 | 2019-08-28 | 317.922 | 28.636 | 2.7 |
| | 21:48:24 | 21:54:58 | | | |
| TRE | 2019-08-29 | 2019-08-29 | 312.857 | 16.364 | 1.3 |
| | 15:43:28 | 15:49:56 | | | |
| TRE | 2019-08-29 | 2019-08-29 | 309.767 | 12.273 | 0.6 |
| | 16:15:23 | 16:21:51 | | | |
| TRE | 2019-08-29 | 2019-08-29 | 321.081 | 32.727 | 3.3 |
| | 20:11:45 | 20:18:19 | | | |
| TRE | 2019-08-29 | 2019-08-29 | 315 | 24.545 | 1.8 |
| | 20:24:55 | 20:31:29 | | | |
| TRE | 2019-08-29 | 2019-08-29 | 325.946 | 32.727 | 0.7 |
| | 20:56:14 | 21:02:42 | | | |
+-------+------------+------------+---------+---------+---------+
TStart and TEnd refer 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
for TCA and TCH and 4.2x4.2 degrees for TRE. The coordinating
observations cover about 26% of the cumulative probability of the
bayestar skymap available on Aug 28, 2019 07:36:47 UTC. The typical
limiting magnitude is 18.0 for a 60.0 s exposure for TCH and TCA and
17.0 for a 60.0 s exposure for TRE.
The coverage map is available at:
https://grandma-owncloud.lal.in2p3.fr/index.php/s/tG92ASJWw5C1tWV
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 spectrometry capabilities for Time-domain
Astronomy (https://grandma.lal.in2p3.fr/). Details on the TAROT
telescopes are available on the GRANDMA web pages or on
http://tarot.obs-hp.fr/.
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