MASTER-Tunka detected optical transient MASTER OT J195939.11+473130.7 at 19h 59m 39.11s +47d 31m 30.7s on 2017-02-27.726 UT with unfilterd m_OT=9.9 (W=0.2B+0.8R calibrated by thousands USNO-B1 stars in the field)