V503 Cyg superoutburst YYYYMMDD(UT) mag observer 20130813.000 <142 (Jose Ripero) 20130814.542 <140 (Tsuneo Horie) 20130812.9625 <142 (A. Klotz) from AAVSO Data 20130813.1000 <146 (J. Bortle) " 20130813.9299 <142 (OJR) " 20130815.1035 142 (J. Bortle) 20130817.0090 135 (Gary Poyner)