MKN421 brighter again? YYYYMMDD(UT) mag observer 20010429.914 129 (G. Poyner) 20010429.935 131 (P. A. Dubovsky) 20010430.913 130 (G. Poyner) 20010501.147 129 (M. Simonsen) 20010502.907 127 (C. P. Jones) 20010504.938 129 (C. P. Jones) 20010505.881 129 (J. Ripero) 20010506.917 129 (G. Poyner) 20010507.901 128 (E. Muyllaert) 20010507.908 130 (G. Poyner) 20010508.919 126 (C. P. Jones) 20010510.151 127 (M. Simonsen) 20010511.880 126 (J. Ripero) 20010511.960 125 (H. McGee)