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GCN Circular 27168

Subject
LIGO/Virgo S200219ac : No significant candidates in TAROT - FRAM - GRANDMA observations.
Date
2020-02-22T12:42:17Z (4 years ago)
From
Martin Blazek at HETH/IAA-CSIC <alf@iaa.es>
M. Blazek (HETH/IAA-CSIC), S. Antier (APC), N. Kochiashvili (Iliauni),
  C. Stachie (Artemis),  (FZU), M. Boer (Artemis), N. Christensen
(Artemis), L. Eymar (Artemis), S. Karpov (FZU), M. Prouza (FZU),
A. Klotz (IRAP), M. Masek (FZU), K. Noysena (Artemis, IRAP),
A. Coleiro (APC), D. Corre (IJCLab), M. Coughlin (UMN), D. Coward
(OzGrav-UWA), J.-G. Ducoin (IJCLab), B. Gendre (OzGrav-UWA), P. Hello
(IJCLab), D. A. Kann (HETH/IAA-CSIC), C. Lachaud (APC), N. Leroy
(IJCLab), C. Thoene (HETH/IAA-CSIC), D. Turpin (AIM-CEA), X. Wang (THU)

report on behalf of the FRAM, TAROT and GRANDMA collaborations.

We performed tiled observations of LIGO/Virgo S200219ac event with the
  FRAM-CTA-N, TAROT-Calern (TCA), TAROT-Chili (TCH), TAROT-Reunion
(TRE) telescopes.

FRAM-CTA-N is located at Observatorio del Roque de los Muchachos. TCA
is located at Calern site at the Cote d'Azur observatory. TCH is
located at La Silla ESO observatory (LaS/ESO). TRE is located at Les
Makes astronomical observatory.

The following table shows for each telescope: the delay in minutes
from the trigger, which filter is used, the field of view of the
telescope in degrees and the typical limiting magnitude (AB mag) for a
  given exposure in seconds (s).

+-------------+---------+----------+-------------+------------+
| Telescope   | Delay   | Filter   | f.o.v.      | Limiting   |
|             | [min]   |          | [deg]       | Mag.       |
|-------------+---------+----------+-------------+------------|
| FRAM-CTA-N  | 799     | R        | 0.45 x 0.45 | 17.0 (90s) |
| TCA         | 512     | Clear    | 1.9 x 1.9   | 18.0 (60s) |
| TCH         | 878     | Clear    | 1.9 x 1.9   | 18.0 (60s) |
| TRE         | 367     | Clear    | 4.2 x 4.2   | 17.0 (60s) |
+-------------+---------+----------+-------------+------------+

We performed the following joint tiled observations [1] :

+-------------+------------+------------+---------+---------+---------+
| Telescope   | TStart     | TEnd       | RA      | DEC     | Proba   |
|             | [UTC]      | [UTC]      | [deg]   | [deg]   | [%]     |
|-------------+------------+------------+---------+---------+---------|
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 189.377 | 55.273  | <0.1    |
|             | 23:03:15   | 23:07:21   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 188.615 | 55.273  | <0.1    |
|             | 23:07:40   | 23:11:46   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 188.613 | 53.963  | <0.1    |
|             | 23:12:01   | 23:16:07   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 188.753 | 55.710  | <0.1    |
|             | 23:16:27   | 23:20:32   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 190.140 | 55.273  | <0.1    |
|             | 23:20:52   | 23:24:59   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 190.414 | 54.837  | <0.1    |
|             | 23:25:18   | 23:29:24   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 189.749 | 55.710  | <0.1    |
|             | 23:29:43   | 23:33:49   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 190.903 | 55.273  | <0.1    |
|             | 23:34:09   | 23:38:14   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 188.149 | 54.837  | <0.1    |
|             | 23:38:30   | 23:42:35   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 187.395 | 54.837  | <0.1    |
|             | 23:42:49   | 23:46:55   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 188.796 | 56.147  | <0.1    |
|             | 23:47:11   | 23:51:17   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-19 | 191.168 | 54.837  | <0.1    |
|             | 23:51:33   | 23:55:39   |         |         |         |
| FRAM-CTA-N  | 2020-02-19 | 2020-02-20 | 189.465 | 53.963  | <0.1    |
|             | 23:55:54   | 00:00:00   |         |         |         |
| FRAM-CTA-N  | 2020-02-20 | 2020-02-20 | 190.355 | 56.147  | <0.1    |
|             | 00:00:14   | 00:04:20   |         |         |         |
| FRAM-CTA-N  | 2020-02-20 | 2020-02-20 | 190.204 | 53.963  | <0.1    |
|             | 00:04:35   | 00:08:41   |         |         |         |
| FRAM-CTA-N  | 2020-02-20 | 2020-02-20 | 187.740 | 55.273  | <0.1    |
|             | 00:09:01   | 00:13:07   |         |         |         |
| FRAM-CTA-N  | 2020-02-20 | 2020-02-20 | 189.659 | 54.837  | <0.1    |
|             | 00:13:22   | 00:17:28   |         |         |         |
| FRAM-CTA-N  | 2020-02-20 | 2020-02-20 | 188.904 | 54.837  | <0.1    |
|             | 00:17:47   | 00:21:53   |         |         |         |
| FRAM-CTA-N  | 2020-02-20 | 2020-02-20 | 189.576 | 56.147  | <0.1    |
|             | 00:22:06   | 00:26:12   |         |         |         |
| FRAM-CTA-N  | 2020-02-20 | 2020-02-20 | 186.640 | 54.837  | <0.1    |
|             | 00:26:27   | 00:30:33   |         |         |         |
| -----       | -----      | -----      | -----   | -----   | -----   |
| TCA         | 2020-02-19 | 2020-02-21 | 192.726 | 57.548  | 0.6     |
|             | 18:16:12   | 20:26:32   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 174.910 | 39.897  | 0.5     |
|             | 18:22:58   | 18:00:16   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 192.200 | 61.259  | 0.5     |
|             | 18:29:42   | 20:38:56   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 190.840 | 63.115  | 0.5     |
|             | 19:08:04   | 21:18:11   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 177.326 | 40.847  | 0.4     |
|             | 19:14:52   | 21:24:53   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 190.593 | 55.692  | 1.0     |
|             | 19:21:37   | 19:21:14   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 186.852 | 51.981  | 0.7     |
|             | 19:53:22   | 20:00:37   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 193.807 | 55.692  | 0.6     |
|             | 20:06:56   | 20:13:03   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 194.796 | 63.115  | 0.6     |
|             | 20:13:40   | 20:19:48   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 195.950 | 61.259  | 0.5     |
|             | 20:45:18   | 20:45:44   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 185.997 | 57.548  | 0.5     |
|             | 20:52:07   | 20:59:12   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 177.226 | 42.703  | 0.5     |
|             | 20:58:52   | 18:35:14   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 187.379 | 55.692  | 0.9     |
|             | 21:37:08   | 19:34:43   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-20 | 185.565 | 53.837  | 0.7     |
|             | 21:50:41   | 02:16:35   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 189.361 | 57.548  | 0.7     |
|             | 21:57:25   | 19:53:56   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 184.164 | 55.692  | 0.5     |
|             | 23:14:53   | 18:41:59   |         |         |         |
| TCA         | 2020-02-19 | 2020-02-21 | 191.719 | 53.837  | 0.8     |
|             | 23:53:28   | 04:41:22   |         |         |         |
| TCA         | 2020-02-20 | 2020-02-21 | 189.803 | 51.981  | 0.6     |
|             | 00:19:17   | 05:07:04   |         |         |         |
| TCA         | 2020-02-20 | 2020-02-21 | 183.901 | 51.981  | 0.5     |
|             | 01:05:11   | 20:52:27   |         |         |         |
| TCA         | 2020-02-20 | 2020-02-21 | 188.642 | 53.837  | 1.0     |
|             | 01:50:02   | 19:27:59   |         |         |         |
| -----       | -----      | -----      | -----   | -----   | -----   |
| TCH         | 2020-02-20 | 2020-02-21 | 22.252  | -30.868 | 0.9     |
|             | 00:21:31   | 02:36:49   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-21 | 23.172  | -34.505 | 0.9     |
|             | 00:23:37   | 02:30:31   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-20 | 24.805  | -32.686 | 0.9     |
|             | 00:27:50   | 02:41:22   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-21 | 25.394  | -34.505 | 0.8     |
|             | 00:39:27   | 02:58:07   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-20 | 17.991  | -30.868 | 0.8     |
|             | 00:52:22   | 01:06:59   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-20 | 8.529   | -17.273 | 0.3     |
|             | 01:02:53   | 01:09:06   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-21 | 16.602  | -21.777 | 0.2     |
|             | 01:22:20   | 01:07:41   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-21 | 36.986  | -41.777 | 0.2     |
|             | 01:37:48   | 03:54:37   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-20 | 19.678  | -29.050 | 1.2     |
|             | 01:46:14   | 02:02:05   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-20 | 17.597  | -29.050 | 1.1     |
|             | 01:55:52   | 02:04:11   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-21 | 17.314  | -27.232 | 1.1     |
|             | 01:57:59   | 02:06:44   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-20 | 22.637  | -32.686 | 1.0     |
|             | 02:10:36   | 02:19:09   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-20 | 20.122  | -30.868 | 1.0     |
|             | 02:20:12   | 02:32:57   |         |         |         |
| TCH         | 2020-02-20 | 2020-02-21 | 170.011 | 25.495  | 0.2     |
|             | 03:47:11   | 06:30:53   |         |         |         |
| TCH         | 2020-02-21 | 2020-02-21 | 20.468  | -32.686 | 0.8     |
|             | 00:30:45   | 00:36:57   |         |         |         |
| TCH         | 2020-02-21 | 2020-02-21 | 8.450   | -14.980 | 0.3     |
|             | 00:45:55   | 00:54:14   |         |         |         |
| TCH         | 2020-02-21 | 2020-02-21 | 6.634   | -16.323 | 0.2     |
|             | 00:54:20   | 00:58:26   |         |         |         |
| TCH         | 2020-02-21 | 2020-02-21 | 19.359  | -27.232 | 1.0     |
|             | 02:11:27   | 02:24:12   |         |         |         |
| -----       | -----      | -----      | -----   | -----   | -----   |
| TRE         | 2020-02-19 | 2020-02-19 | 14.595  | -32.727 | 0.6     |
|             | 15:51:04   | 15:57:26   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 24.324  | -32.727 | 4.1     |
|             | 16:04:16   | 15:57:55   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 18.000  | -24.545 | 2.9     |
|             | 16:16:33   | 16:11:12   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 25.714  | -36.818 | 2.2     |
|             | 16:42:21   | 16:36:33   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 14.026  | -28.636 | 1.6     |
|             | 17:13:59   | 17:08:08   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 46.452  | -45.000 | 1.2     |
|             | 17:52:19   | 17:46:24   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 30.857  | -36.818 | 0.9     |
|             | 18:17:49   | 18:12:03   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 34.839  | -45.000 | 0.7     |
|             | 18:45:31   | 18:37:29   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 165.405 | 32.727  | 0.7     |
|             | 18:56:44   | 18:50:56   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-19 | 170.270 | 32.727  | 2.4     |
|             | 20:17:26   | 20:23:42   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 175.135 | 32.727  | 1.6     |
|             | 20:49:04   | 21:53:11   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 168.312 | 28.636  | 1.4     |
|             | 21:20:58   | 22:25:08   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-19 | 172.987 | 28.636  | 1.1     |
|             | 21:53:12   | 21:59:28   |         |         |         |
| TRE         | 2020-02-19 | 2020-02-20 | 166.500 | 24.545  | 0.7     |
|             | 22:37:46   | 23:43:55   |         |         |         |
| TRE         | 2020-02-20 | 2020-02-20 | 50.526  | -49.091 | 1.4     |
|             | 17:14:45   | 17:21:01   |         |         |         |
| TRE         | 2020-02-20 | 2020-02-20 | 20.571  | -36.818 | 1.2     |
|             | 17:27:55   | 17:34:12   |         |         |         |
+-------------+------------+------------+---------+---------+---------+

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.

These observations cover about 44.0% of the cumulative probability of
the BAYESTAR skymap created on 2020-02-19 11:14:17 (UTC).


The coverage map is available at:
https://grandma-
owncloud.lal.in2p3.fr/index.php/s/XgtMhPRxcyL09gR/download?
path=%2F&files=GRANDMA_S200219ac_1582328915.svg

No significant transient candidates were found during our low latency
analysis [2,3].

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 [2](https://grandma.lal.in2p3.fr/).

Details on the different telescopes are available on the GRANDMA web
pages.

[1] M. W Coughlin et al., MNRAS 2019, https://doi.org/10.1093/mnras/stz2485
[2] S. Antier et al., MNRAS 2020, https://doi.org/10.1093/mnras/stz3142
[3] K. Noysena et al., ApJ 2019, arXiv:1910.02770
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