MKN421 active state update YYYYMMDD(UT) mag observer 20010219.278 127 (M. Simonsen) 20010219.628 124 (H. Itoh) 20010219.919 127V (D. Rodriguez) 20010221.919 123V (D. Rodriguez) 20010221.960 126 (J. Ripero) 20010222.919 124 (J. Ripero) 20010223.938 126 (G. Poyner) 20010224.837 126 (E. Muyllaert) 20010225.530 127 (T. Watanabe) 20010225.551 128 (T. Watanabe) 20010225.931 126 (E. Muyllaert) 20010225.949 124 (J. Ripero) 20010227.810 128 (P. A. Dubovsky) 20010227.919 127 (M. Reszelski) 20010228.294 126 (M. Simonsen) 20010301.308 128 (M. Simonsen) 20010301.874 128 (G. Poyner) 20010301.937 123 (H. McGee) 20010301.972 126 (M. Reszelski) 20010303.017 125 (M. Reszelski)