V1504 Cyg superoutburst fading YYYYMMDD(UT) mag observer 20010330.090 139 (T. Kinnunen) 20010403.080 144 (T. Kinnunen) 20010407.069 147 (T. Kinnunen) 20010411.069 <148 (T. Kinnunen) 20010412.962 150: (M. Reszelski) 20010415.001 155 (M. Reszelski)