[ Previous | Next | ADS ]

MASTER Early Optical Polarization Observations of Black Hole Candidate V404 Cyg and 10 Minutes Polarization Variability Detection.

ATel #7696; V. Lipunov (Lomonosov MSU), R. Rebolo (IAC), E. Gorbovskoy (Lomonosov MSU),M. Serra-Ricart (IAC), O. Gress (ISU), N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), V. Kornilov, N. Tiurina, P. Balanutsa, E. Popova, V. Chazov (Lomonosov Moscow State University, Sternberg Astronomical Institute), V. Krushinsky (Ural Federal University), N. Budnev, K. Ivanov (Applied Physics Institute of Irkutsk State University), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station of of the Pulkovo observatory RAS), D. Buckley, S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), Yu. Sergienko, V. Yurkov, A. Gabovich (Blagoveschensk State Educational University)
on 23 Jun 2015; 12:17 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Black Hole

Referred to by ATel #: 7708, 7710, 7721, 7722, 7725, 7734, 7740, 7959

MASTER Robotic Net (MASTER-Net: http://observ.pereplet.ru ) was started observation of one of the best Black Hole candidate - V404 Cyg by GCN Swift trigger N 643949 at 2015-06-15 18:34:09 UT (Barthelmy et. al GCN #17929 ) i.e. 22 sec after notice time and 150 sec after trigger time. The 5 MASTER robotic twin telescopes every clear night observed V404 Cyg.

 
 
 Site          DATE  UT Start         DATE  UT Finish    Exp  Duration    Polarisation 
      
 Tunka      2015-06-15 18:34:23    2015-06-15 19:33:48   40    1.0 h          |-         
2 Ural      2015-06-15 18:34:09    2015-06-15 19:42:09   10    1.1 h          /\ 
3 IAC       2015-06-18 00:09:07    2015-06-18 05:26:19  190    5.2 h          |- 
4 Tunka     2015-06-18 14:45:47    2015-06-18 19:44:43   96    5.0 h 
5 Kisl      2015-06-18 18:50:29    2015-06-19 00:34:30  176    5.4 h 
6 SAAO      2015-06-18 22:19:33    2015-06-19 04:42:30  282    6.5 h 
7 Tunka     2015-06-19 14:21:47    2015-06-19 19:12:1    90    4.9 h 
8 Kisl      2015-06-19 18:08:38    2015-06-19 22:02:20  108    3.1 h 
9 SAAO      2015-06-19 21:26:05    2015-06-20 04:41:46  318    7.3 h 
10 Tunka    2015-06-20 16:07:32    2015-06-20 19:33:50   59    3.5 h 
11 Kisl     2015-06-20 17:55:38    2015-06-20 20:24:19   36    3.5 h 
12 SAAO     2015-06-20 21:59:20    2015-06-21 04:43:37  320    6.7 h 
13 Tunka    2015-06-21 19:04:51    2015-06-21 19:36:31   26    0.5 h 
14 SAAO     2015-06-21 21:16:36    2015-06-22 04:43:06  320    7.5 h 
15 Kisl     2015-06-21 21:30:56    2015-06-22 00:36:31   78    3.0 h 
16 SAAO     2015-06-22 21:15:28    2015-06-23 04:43:58  260    7.5 h  

We have more than 2400 mesuarments now; The preliminary photometry of MASTER-Net telescopes are available at http://master.sai.msu.ru/static/OT/MASTERV404.jpg

We see > 8% linear polarisation ( that corresponds to ATEL #7678 , ATEL #7674). We defenitely detect polatizations variability at time scale ~10 minutes.

The Ural light curves (upper fig.) VS polarization (below) data are available at http://master.sai.msu.ru/static/v404syg_tu.png

The observations are continued.

MASTER Global Robotic Net