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The Advanced LIGO observatory recently reported the first direct detection ofgravitational waves predicted by Einstein (1916). We report on the firstoptical observations of the Gravitational Wave (GW) source GW150914 errorregion with the Global MASTER Robotic Net. We detected several opticaltransients, which proved to be unconnected with the GW event. Our result isconsistent with the assumption that gravitational waves were produced by abinary black hole merger. The detection of the event confirmed the mainprediction of the population synthesis performed with the "Scenario Machine"formulated in Lipunov1997b.

First Gravitational-Wave Burst GW150914: Part II. MASTER Optical Follow-Up Observations