Likely superoutburst of V503 Cyg The SU UMa-type dwarf nova V503 Cyg is undergoing a bright outburst as indicated by the following observations. The latest superoutburst of V503 Cyg was observed in 1998 May (Poyner et al.). YYMMDD(UT) mag observer 980821.910 <150 (G. Poyner) 980822.964 <156 (G. Poyner) 980823.187 <152 (G. Hanson) 980824.971 <156 (G. Poyner) 980826.235 133 (G. Hanson) 980826.451 134 (G. Hanson)