V660 Her further brightens The SU UMa-type dwarf nova V660 Her has further brightened. The object is in outburst for more than three nights, and is very likely a superoutburst. Time-resolved photometry during this outburst is strongly encouraged. YYYYMMDD(UT) mag observer 20010519.207 <141 (M. Simonsen) 20010519.949 <156 (M. Reszelski) 20010520.017 <156 (G. Poyner) 20010520.190 <145 (M. Simonsen) 20010520.926 <148 (M. Reszelski) 20010520.941 <153 (P. A. Dubovsky) 20010522.010 <153 (G. Poyner) 20010522.947 <153 (P. A. Dubovsky) 20010522.958 <156 (M. Reszelski) 20010523.033 <153 (G. Poyner) 20010523.953 <156 (G. Poyner) 20010523.964 <156 (M. Reszelski) 20010524.948 <156 (M. Reszelski) 20010524.965 155 (P. A. Dubovsky) 20010526.978 147 (M. Reszelski) Regards, VSNET Collaboration team