SN 2001ay up to now YYYYMMDD(UT) mag observer 20010404.400 <185C (KAIT (from IAUC)) 20010418.399 169:C (KAIT (from IAUC)) 20010419.199 170:C (M. Schwartz) 20010420.940 164CR (D. Lefoulon) 20010421.982 15.87CR (R. Ferrando) 20010422.103 165CR (J. M. Llapasset) 20010422.917 162C (O. Trondal) 20010423.430 167V (Jha et al. (from IAUC)) 20010423.949 166C (D. Rodriguez) 20010424.903 165CR (R. Goncalves) 20010425.221 164CR (D. Dillinger) 20010425.899 16.40C (D. Rodriguez) 20010426.949 163CR (R. Roy) 20010427.583 16.42CR (Y. Sano) 20010427.954 151C (Zs. Kereszty) 20010428.078 163CR (J. M. Llapasset) 20010428.967 16.60C (D. Rodriguez) 20010428.985 164CR (G. Masi) 20010429.125 161C (F. M. Ewalt) 20010429.928 164:CR (A. Danielsen) 20010501.496 16.48CR (Y. Sano) 20010501.930 166CR (D. Lefoulon) 20010501.990 166:CR (A. Danielsen) 20010502.665 16.50CR (Y. Sano) 20010503.244 166CR (D. Dillinger) 20010507.542 16.57CR (Y. Sano) 20010508.878 168CR (J. M. Llapasset) 20010508.931 168C (O. Trondal) 20010510.906 167CR (R. Goncalves) 20010511.219 167CR (D. Dillinger) 20010511.567 16.75CR (Y. Sano) 20010512.926 169:CR (J. M. Llapasset) 20010513.613 16.82CR (Y. Sano)