MKN421 brightening Bob King (Duluth, MN, USA) reports the optical brightening of MKN421 (vsnet-obs 20403). YYMMDD(UT) mag observer 990405.606 131 (T. Watanabe) 990407.626 132 (T. Watanabe) 990408.576 131 (T. Watanabe) 990409.940 131 (G. Poyner) 990409.949 132 (H. McGee) 990410.933 132 (G. Poyner) 990413.574 130 (T. Watanabe) 990413.960 132 (G. Poyner) 990414.981 132 (G. Poyner) 990424.903 129 (G. Poyner) 990427.910 128 (G. Poyner) 990427.951 <127 (D. Gill) 990428.940 129 (G. Poyner) 990503.137 125 (B. King)