V1504 Cyg outburst YYMMDD(UT) mag observer 980929.919 <152 (T. Kinnunen) 980930.880 <151 (T. Kinnunen) 980930.890 <150 (G. Poyner) 981001.869 <152 (T. Kinnunen) 981002.799 <152 (T. Kinnunen) 981003.019 <150 (G. Poyner) 981003.760 <152 (T. Kinnunen) 981006.769 <152 (T. Kinnunen) 981007.730 <152 (T. Kinnunen) 981009.958 <155 (G. Poyner) 981011.907 <155 (G. Poyner) 981012.740 147 (T. Kinnunen)