V503 Cyg outburst The SU UMa-type dwarf nova V503 Cyg is undergoing an outburst, which may be a slightly unusual superoutburst. YYYYMMDD(UT) mag observer 20000522.053 <150 (G. Poyner) 20000522.987 <142 (E. Muyllaert) 20000523.265 <146 (G. Hanson) 20000524.057 <150 (G. Poyner) 20000524.253 <146 (G. Hanson) 20000525.469 <150 (G. Hanson) 20000525.976 <138 (E. Muyllaert) 20000527.253 143 (G. Hanson) 20000527.971 142 (M. Reszelski) 20000528.287 142 (G. Hanson)