MASTER-IAC detected optical transient MASTER OT J200538.50+452429.8 at 20h 05m 38.50s +45d 24m 29.8s on 2017-02-18.257 UT with unfilterd m_OT=13.76 (W=0.2B+0.8R calibrated by thousands USNO-B1 stars in field)