GX Cas possible superoutburst The long-period SU UMa-type dwarf nova GX Cas is undergoing an outburst. The outburst interval suggests a superoutburst. Follow-up observations are encouraged. YYYYMMDD(UT) mag observer 20000804.950 <141 (E. Muyllaert) 20000805.940 <145 (T. Kinnunen) 20000805.967 <152 (M. Reszelski) 20000807.940 <145 (T. Kinnunen) 20000808.944 <152 (G. Poyner) 20000808.987 <134 (H. McGee) 20000809.019 <141 (E. Muyllaert) 20000810.910 <145 (T. Kinnunen) 20000812.049 <152 (G. Poyner) 20000812.906 <134 (E. Muyllaert) 20000813.860 <141 (T. Kinnunen) 20000814.869 <141 (T. Kinnunen) 20000814.940 <141 (E. Muyllaert) 20000816.887 <138 (M. Reszelski) 20000817.880 <145 (T. Kinnunen) 20000817.903 <141 (E. Muyllaert) 20000817.917 <142 (M. Reszelski) 20000819.880 <145 (T. Kinnunen) 20000821.060 137 (G. Poyner) 20000821.133 139 (M. Simonsen) 20000821.276 139 (M. Simonsen)