V503 Cyg superoutburst, fading YYYYMMDD(UT) mag observer 20010820.875 139 (J. Ripero) 20010820.885 140 (E. Muyllaert) 20010821.302 138 (M. Simonsen) 20010821.871 141 (E. Muyllaert) 20010823.026 145 (M. Reszelski) 20010824.267 <142 (M. Simonsen) 20010824.978 145 (P. A. Dubovsky) 20010825.072 142 (H. McGee) 20010825.878 <142 (E. Muyllaert) 20010826.989 150 (M. Reszelski) 20010827.180 <142 (M. Simonsen)