David Bersier Liverpool John Moores University Andrew S. Fruchter Space Telescope Science Institute Peter M. Garnavich University of Notre Dame Javier Gorosabel Instituto de Astrofisica de Andalucia (IAA) Stephen T. Holland Eureka Scientific Inc. Daniel Kasen University of California - Berkeley Andrew James Levan Radboud University Nijmegen Paolo A. Mazzali Liverpool John Moores University Peter E. Nugent Lawrence Berkeley National Laboratory Elena Pian INAF - Osservatorio di Astrofisica e Scienza dello Spazio Nial Rahil Tanvir University of Leicester Ralph A.M.J. Wijers Universiteit van Amsterdam Stan Woosley University of California - Santa Cruz