TITLE:   GCN CIRCULAR
NUMBER:  21068
SUBJECT: LIGO/Virgo G284239: TZAC TAROT network observations with TRE/TCA/TCH
DATE:    17/05/04 15:19:44 GMT
FROM:    Michel Boer at CESR-CNRS  <michel.boer@unice.fr>

M. Boer, R. Laugier, K. Noysena (ARTEMIS - CNRS/UCA/OCA), A. Klotz, D. Turpin (IRAP
- CNRS/UPS) report on behalf of the TZAC collaboration.

The TAROT network of telescopes has observed part of the error box of
the GW trigger G284239 (GCN 21060). The observations
took place at TCA (TAROT OCA Calern observatory, France), TCH (TAROT
Chile, ESO La Silla Observatory), and TRE (TAROT Les Makes Observatory,
La Réunion Island, France) during the respective night of May 3-4, 2017, and will continue the next night.
The field of view of TCA and TCH is 1.86° (square), and
4.2° for TRE. 5 fields have been observed by TCA, 5 for TCH and 9 for
TRE, resulting in a total of 179 sq. deg. explored in the error box.
The exposures lasted 120s with no filter, resulting in
approximate limiting magnitude of R < 18 for TCA and TCH (depending on
the conditions and Moon) and 17 for TRE. The list of the fields is given
below.

Analysis is underway.

List of fields:
Site	     Field# 	RA          DEC		UTC Start time
'Tarot_Calern'	0	18:07:47    -21:10:48	2017-05-03T23:39:00.974
'Tarot_Calern'	1	18:08:32    -23:2:24	2017-05-03T23:43:20.974
'Tarot_Calern'	2	18:16:37    -23:2:24	2017-05-04T00:11:50.974
'Tarot_Calern'	3	18:18:40    -24:54:0	2017-05-04T00:16:10.974
'Tarot_Calern'	4	18:00:21    -19:19:12	2017-05-03T23:32:10.974
'Tarot_Chili'	0	18:07:47    -21:10:48	2017-05-04T02:08:41.869
'Tarot_Chili'	1	18:08:32    -23:2:24	2017-05-04T02:13:01.869
'Tarot_Chili'	2	18:16:37    -23:2:24	2017-05-04T02:17:21.869
'Tarot_Chili'	3	18:18:40    -24:54:0	2017-05-04T02:21:41.869
'Tarot_Chili'	4	18:00:21    -19:19:12	2017-05-04T02:01:51.869
'Tarot_Reunion'	0	18:18:29    -22:47:59	2017-05-03T18:51:47.549
'Tarot_Reunion'	1	18:31:53    -26:59:59	2017-05-03T18:58:17.549
'Tarot_Reunion'	2	18:00:16    -22:47:59	2017-05-03T17:54:47.549
'Tarot_Reunion'	3	17:53:50    -18:35:59	2017-05-03T18:01:17.549
'Tarot_Reunion'	4	18:11:33    -18:35:59	2017-05-03T18:07:47.549
'Tarot_Reunion'	5	18:13:01    -26:59:59	2017-05-03T18:14:17.549
'Tarot_Reunion'	6	18:32:52    -31:11:59	2017-05-03T18:20:47.549
'Tarot_Reunion'	7	17:53:12    -14:23:59	2017-05-03T18:27:17.549
'Tarot_Reunion'	8	17:40:58    -10:11:59	2017-05-03T18:33:47.549
'Tarot_Reunion'	9	18:40:16    -35:23:59	2017-05-03T18:40:17.549