GX Cas superoutburst (update) YYMMDD(UT) mag observer 981001.860 <152 (T. Kinnunen) 981002.769 <152 (T. Kinnunen) 981003.069 <152 (G. Poyner) 981003.790 <145 (T. Kinnunen) 981005.769 <141 (T. Kinnunen) 981006.760 137 (T. Kinnunen) 981007.130 138 (G. Hanson) 981007.751 136 (T. Kinnunen) 981008.949 137 (T. Kinnunen) 981009.040 138 (G. Poyner) 981009.135 137 (G. Hanson) 981009.923 137 (G. Poyner) 981010.067 133 (R. J. Modic) 981010.151 138 (G. Hanson) 981011.115 138 (G. Hanson) 981011.771 139 (E. Muyllaert) 981011.851 140 (G. Poyner) 981012.162 138 (G. Hanson)