V503 Cyg superoutburst YYYYMMDD(UT) mag observer 20160725.898 <149 (Jose Ripero) 20160725.951 <140 (Eddy Muyllaert) 20160726.951 142 (Eddy Muyllaert) 20160727.649 140 (Hiroyuki Maehara) 20160727.951 143 (Pavol A. Dubovsky)