Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 26947

Subject
LIGO/Virgo S200128d : No significant candidates in FRAM - TAROT - GRANDMA observations
Date
2020-01-31T09:00:44Z (4 years ago)
From
Cosmin Stachie at Artemis, Nice, France <scosmin@oca.eu>
C. Stachie (Artemis), S. Beradze (Iliauni), D. A. Kann (HETH/IAA-CSIC), 
Z. Vidadi (SHAO), S. Karpov (FZU), M. Masek (FZU), 
M. Prouza (FZU), M. Boer (Artemis), N. Christensen (Artemis), 
L. Eymar (Artemis), A. Klotz (IRAP), K. Noysena (Artemis, IRAP), 
S. Antier (APC), A. Coleiro (APC), D. Corre (IJCLab), 
M. Coughlin (UMN), D. Coward (OzGrav-UWA), J.G. Ducoin (IJCLab), 
B. Gendre (OzGrav-UWA), P. Hello (IJCLab), N. Kochiashvili (Iliauni), 
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 S200128d event with the 
FRAM-Auger, FRAM-CTA-N, TAROT-Calern (TCA), TAROT-Chili (TCH) 
telescopes. 

FRAM-Auger is located at Pierre Auger Observatory. 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). 

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-Auger | 27 | R | 1.0 x 1.0 | 18.0 (60s) | 
| FRAM-CTA-N | 24 | R | 0.45 x 0.45 | 17.0 (90s) | 
| TCA | 1148 | Clear | 1.9 x 1.9 | 18.0 (60s) | 
| TCH | 155 | Clear | 1.9 x 1.9 | 18.0 (60s) | 
+-------------+---------+----------+-------------+------------+ 

We performed the following joint tiled observations [1] : 

+-------------+------------+------------+---------+---------+---------+ 
| Telescope | TStart | TEnd | RA | DEC | Proba | 
| | [UTC] | [UTC] | [deg] | [deg] | [%] | 
|-------------+------------+------------+---------+---------+---------| 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 60.583 | 33.568 | 0.1 | 
| | 02:46:24 | 02:50:51 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 59.240 | 31.622 | 0.1 | 
| | 02:51:26 | 02:55:53 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 233.660 | -44.270 | 0.1 | 
| | 04:14:01 | 04:18:28 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 230.504 | -41.351 | 0.1 | 
| | 04:19:04 | 04:23:31 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 226.623 | -34.541 | 0.1 | 
| | 05:17:46 | 05:22:12 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 228.980 | -37.459 | 0.1 | 
| | 05:22:47 | 05:27:14 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 229.655 | -38.432 | 0.1 | 
| | 05:27:48 | 05:32:15 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 227.755 | -37.459 | 0.1 | 
| | 05:32:50 | 05:37:17 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 230.350 | -39.405 | 0.1 | 
| | 05:37:53 | 05:42:20 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 231.064 | -40.378 | 0.1 | 
| | 05:42:54 | 05:47:21 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 236.250 | -46.216 | 0.1 | 
| | 06:31:19 | 06:35:46 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 227.803 | -34.541 | 0.1 | 
| | 06:36:24 | 06:40:51 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 234.483 | -45.243 | 0.1 | 
| | 06:41:27 | 06:45:54 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 237.143 | -47.189 | 0.1 | 
| | 06:46:29 | 06:50:56 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 230.204 | -37.459 | 0.1 | 
| | 06:51:33 | 08:00:09 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 224.430 | -31.622 | 0.1 | 
| | 08:00:46 | 08:05:13 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 228.414 | -38.432 | 0.1 | 
| | 08:05:48 | 08:10:15 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 233.333 | -43.297 | 0.1 | 
| | 08:10:52 | 08:15:18 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 235.862 | -45.243 | 0.1 | 
| | 08:15:54 | 08:20:21 | | | | 
| FRAM-Auger | 2020-01-28 | 2020-01-28 | 234.667 | -43.297 | 0.1 | 
| | 08:20:55 | 08:25:22 | | | | 
| ----- | ----- | ----- | ----- | ----- | ----- | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 71.752 | 42.604 | <0.1 | 
| | 02:44:06 | 03:07:01 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 65.302 | 38.672 | <0.1 | 
| | 02:48:28 | 03:11:23 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 67.761 | 40.419 | <0.1 | 
| | 02:52:54 | 03:15:44 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 63.885 | 37.136 | <0.1 | 
| | 03:16:00 | 03:20:06 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 66.531 | 38.672 | <0.1 | 
| | 03:20:26 | 03:24:32 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 65.125 | 37.897 | <0.1 | 
| | 03:24:45 | 03:28:51 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 64.770 | 37.361 | <0.1 | 
| | 03:29:10 | 03:33:16 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 67.760 | 38.672 | <0.1 | 
| | 03:33:33 | 03:37:39 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 65.980 | 39.645 | <0.1 | 
| | 03:37:54 | 03:42:00 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 228.239 | -37.348 | <0.1 | 
| | 07:00:51 | 07:04:57 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 228.425 | -36.812 | <0.1 | 
| | 07:05:11 | 07:09:16 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 229.117 | -37.348 | <0.1 | 
| | 07:09:29 | 07:13:35 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 230.179 | -38.334 | <0.1 | 
| | 07:13:49 | 07:17:55 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 227.368 | -35.163 | <0.1 | 
| | 07:18:28 | 07:22:34 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 227.361 | -37.348 | <0.1 | 
| | 07:22:48 | 07:26:54 | | | | 
| FRAM-CTA-N | 2020-01-28 | 2020-01-28 | 230.005 | -37.348 | <0.1 | 
| | 07:27:08 | 07:29:08 | | | | 
| ----- | ----- | ----- | ----- | ----- | ----- | 
| TCA | 2020-01-28 | 2020-01-29 | 61.323 | 34.805 | 0.4 | 
| | 21:27:35 | 00:33:56 | | | | 
| TCA | 2020-01-28 | 2020-01-29 | 66.832 | 38.991 | 0.3 | 
| | 21:34:18 | 00:40:37 | | | | 
| TCA | 2020-01-28 | 2020-01-28 | 70.467 | 42.703 | 0.3 | 
| | 21:46:45 | 22:53:03 | | | | 
| TCA | 2020-01-28 | 2020-01-28 | 63.559 | 35.280 | 0.3 | 
| | 21:53:29 | 22:59:48 | | | | 
| TCA | 2020-01-28 | 2020-01-28 | 57.317 | 29.713 | 0.3 | 
| | 22:00:14 | 23:06:33 | | | | 
| TCA | 2020-01-28 | 2020-01-28 | 65.154 | 37.136 | 0.3 | 
| | 23:21:05 | 23:23:05 | | | | 
| ----- | ----- | ----- | ----- | ----- | ----- | 
| TCH | 2020-01-28 | 2020-01-30 | 236.439 | -47.232 | 0.4 | 
| | 04:55:03 | 09:27:07 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 232.208 | -39.959 | 0.4 | 
| | 05:16:40 | 07:23:02 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 227.365 | -36.323 | 0.4 | 
| | 05:23:26 | 07:29:47 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 232.731 | -41.777 | 0.4 | 
| | 05:30:10 | 07:36:31 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 223.609 | -29.050 | 0.4 | 
| | 05:42:41 | 07:48:57 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 237.200 | -49.050 | 0.4 | 
| | 05:51:36 | 07:55:42 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 224.144 | -30.868 | 0.4 | 
| | 05:56:12 | 08:02:14 | | | | 
| TCH | 2020-01-28 | 2020-01-28 | 241.967 | -52.686 | 0.3 | 
| | 06:12:54 | 08:42:48 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 240.950 | -50.868 | 0.3 | 
| | 06:19:40 | 08:21:39 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 246.260 | -54.505 | 0.3 | 
| | 06:24:14 | 08:28:21 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 230.265 | -41.777 | 0.3 | 
| | 06:34:31 | 08:41:03 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 231.654 | -43.595 | 0.3 | 
| | 06:41:17 | 08:47:37 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 225.394 | -34.505 | 0.3 | 
| | 06:48:00 | 08:54:21 | | | | 
| TCH | 2020-01-28 | 2020-01-28 | 229.824 | -39.959 | 0.4 | 
| | 07:27:31 | 07:33:50 | | | | 
| TCH | 2020-01-28 | 2020-01-30 | 240.012 | -49.050 | 0.4 | 
| | 07:34:15 | 07:10:36 | | | | 
| TCH | 2020-01-29 | 2020-01-29 | 227.617 | -34.505 | 0.3 | 
| | 05:00:12 | 05:02:12 | | | | 
| TCH | 2020-01-29 | 2020-01-30 | 249.525 | -56.323 | 0.3 | 
| | 05:23:56 | 06:30:48 | | | | 
| TCH | 2020-01-30 | 2020-01-30 | 234.189 | -43.595 | 0.4 | 
| | 05:06:42 | 05:13:01 | | | | 
| TCH | 2020-01-30 | 2020-01-30 | 235.733 | -45.414 | 0.4 | 
| | 05:36:58 | 08:08:55 | | | | 
+-------------+------------+------------+---------+---------+---------+ 

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 9.7% of the cumulative probability of 
the BAYESTAR skymap created on 2020-01-28 02:22:21 (UTC). 


The coverage map is available at: 
https://grandma-owncloud.lal.in2p3.fr/index.php/s/XgtMhPRxcyL09gR/download?path=%2F&files=GRANDMA_S200128d_1580458038.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 2019, https://doi.org/10.1093/mnras/stz3142 
[3] K. Noysena et al., ApJ 2019, arXiv:1910.02770
Looking for U.S. government information and services? Visit USA.gov