Superoutburst of V1504 Cyg (update) YYMMDD(UT) mag observer 980717.994 <155 (G. Poyner) 980724.033 151 (G. Poyner) 980724.094 151 (G. Poyner) 980724.999 153 (G. Poyner) 980802.035 147 (G. Poyner) 980803.992 141 (G. Poyner) 980804.928 141 (G. Poyner) 980805.919 141 (T. Kinnunen) 980805.994 142 (G. Poyner) 980806.919 140 (T. Kinnunen) 980806.957 146 (G. Poyner) 980808.910 144 (T. Kinnunen) 980809.019 147 (G. Poyner)