MKN421 fading update YYYYMMDD(UT) mag observer 20000606.944 134 (G. Poyner) 20000607.226 131 (G. Hanson) 20000607.885 132 (J. Ripero) 20000609.189 131 (G. Hanson) 20000610.190 131 (G. Hanson) 20000610.194 132 (M. Simonsen) 20000610.928 132 (C. P. Jones) 20000611.199 131 (G. Hanson) 20000612.918 129 (C. P. Jones) 20000617.964 132 (G. Poyner) 20000618.962 132 (G. Poyner) 20000618.964 133 (H. McGee) 20000620.178 133 (G. Hanson) 20000621.949 134 (H. McGee) 20000621.976 132 (G. Poyner) 20000622.192 134 (G. Hanson) 20000623.176 134 (G. Hanson) 20000625.173 135 (G. Hanson) 20000626.974 132 (G. Poyner) 20000627.899 138 (J. Ripero) 20000703.169 135 (G. Hanson) 20000704.125 135 (G. Hanson) 20000704.892 135V (D. Rodriguez) 20000705.203 136 (G. Hanson) 20000706.174 137 (G. Hanson) 20000707.173 137 (G. Hanson) 20000707.908 135 (C. P. Jones)