We thank L. Germany, B. Schmidt, R. Stathakis and H. Johnston for sending us the raw data on the early spectrum, P. Schechter for help with DoPhot and R. Hook for advise on image analysis. We also thank G. Contardo for help with and P. Lundqvist for interesting discussions on CSM interaction. We are grateful to the La Palma observatory & Royal Greenwich Observatory for the possibility to access their SN 1993J database by ftp, and we thank the NTT service observation team for nice service observations. J. Sollerman is grateful to the ESO Studentship that allowed his stay in Garching, where this work was conducted.
© European Southern Observatory (ESO) 1998
Online publication: August 6, 1998