TITLE:   GCN CIRCULAR
NUMBER:  24549
SUBJECT: LIGO/Virgo S190513bm : TAROT-Calern and TAROT-Chile (TCA/TCH)/GRANDMA observation report.
DATE:    19/05/15 04:10:45 GMT
FROM:    Hayden Crisp at OzGrav  <20934203@student.uwa.edu.au>

H. Crisp (OzGrav-UWA), S. Alishov (SHAO), S. Beradze (Iliauni), P.
Lognone (LAL), M. Boer (Artemis), N. Christensen (Artemis), L. Eymar
(Artemis), A. Klotz (IRAP), K. Noysena (Artemis, 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), P. Hello
(LAL), C. Lachaud (APC), N. Leroy (LAL), D. Turpin (NAOC)

Report on behalf of the TAROT network and GRANDMA collaborations.

We performed tiled observations of LIGO/Virgo S190513bm event (GCN
#24522) with the TAROT-Chili (TCH) telescope operating with a clear
filter located at La Silla ESO observatory (LaS/ESO), and with the
TAROT-Calern (TCA) telescope operating with a clear filter located at
Calern site at the Cote d'Azur observatory.

The TCA observation started on 05/13/19 21:34:47 UTC which corresponds
approximately to 41 minutes after the GW trigger time.

We performed the following tiled observations :
+------------+------------+---------+---------+---------+
| TStart     | TEnd       | RA      | DEC     |   Proba |
| [UTC]      | [UTC]      | [deg]   | [deg]   |     [%] |
|------------+------------+---------+---------+---------|
| 2019-05-13 | 2019-05-14 | 56.471  | 59.091  |     1.4 |
| 21:34:47   | 03:04:02   |         |         |         |
| 2019-05-13 | 2019-05-14 | 53.333  | 57.273  |     1   |
| 21:41:36   | 03:10:51   |         |         |         |
| 2019-05-13 | 2019-05-14 | 56.667  | 57.273  |     1.5 |
| 22:13:26   | 02:59:27   |         |         |         |
| 2019-05-13 | 2019-05-14 | 60      | 57.273  |     1   |
| 23:19:10   | 02:21:45   |         |         |         |
| 2019-05-14 | 2019-05-14 | 60      | 59.091  |     1   |
| 00:21:32   | 02:28:35   |         |         |         |
| 2019-05-14 | 2019-05-14 | 55.67   | 60.909  |     0.7 |
| 00:34:43   | 02:40:30   |         |         |         |
| 2019-05-14 | 2019-05-14 | 52.941  | 59.091  |     0.8 |
| 01:28:38   | 01:35:09   |         |         |         |
+------------+------------+---------+---------+---------+

The TCH observation started on 05/14/19 02:55:11 UTC which corresponds
approximately to 361 minutes after the GW trigger time.

We performed the following tiled observations :
+------------+------------+---------+---------+---------+
| TStart     | TEnd       | RA      | DEC     |   Proba |
| [UTC]      | [UTC]      | [deg]   | [deg]   |     [%] |
|------------+------------+---------+---------+---------|
| 2019-05-14 | 2019-05-14 | 287.168 | -30     |     5.1 |
| 02:55:11   | 10:01:41   |         |         |         |
| 2019-05-14 | 2019-05-14 | 286.364 | -28.182 |     3.6 |
| 03:02:00   | 10:08:29   |         |         |         |
| 2019-05-14 | 2019-05-14 | 285.087 | -30     |     3   |
| 03:08:48   | 10:15:17   |         |         |         |
| 2019-05-14 | 2019-05-14 | 288.409 | -28.182 |     2.3 |
| 03:21:12   | 10:27:36   |         |         |         |
| 2019-05-14 | 2019-05-14 | 285.444 | -31.818 |     2.1 |
| 03:28:01   | 09:34:24   |         |         |         |
| 2019-05-14 | 2019-05-14 | 289.249 | -30     |     1.6 |
| 03:34:49   | 09:41:13   |         |         |         |
+------------+------------+---------+---------+---------+

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. The TCA  and TCH telescope observations cover
7% and 17% of the cumulative probability of the skymap respectively,
for a total of 24% coverage. 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/Doq7WNvbtg47blh

Potential optical transient candidates list will be sent
through another GCN circular depending on our data 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/.

 This circular is citable.