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On 2015 June 15 the Swift space observatory discovered that the Galacticblack hole candidate V404 Cyg was undergoing another active X-ray phase, after25 years of inactivity (Barthelmy et al. 2015). Twelve telescopes of the MASTERGlobal Robotic Net located at six sites across four continents were the firstground based observatories to start optical monitoring of the microquasar afterits gamma-ray wakeup at 18h 34m 09s U.T. on 2015 June 15 (Lipunov et al. 2015).In this paper we report, for the first time, the discovery of variable opticallinear polarization, changing by 4-6% over a timescale of approximately 1 h, ontwo different epochs. We can conclude that the additional variable polarizationarisies from the relativistic jet generated by the black hole in V404Cyg. Thepolarization variability correlates with optical brightness changes, increasingwhen the flux decreases.

MASTER optical polarization variability detection in the Microquasar V404 Cyg/GS2023+33