Heger, A. (Chicago Univ. Chicago, IL, United States)
Fryer, C. L. (Los Alamos National Lab. NM, United States)
Woosley, S. E. (California Univ. Santa Cruz, CA, United States)
Langer, N. (Astronomical Inst. Utrecht, Netherlands)
Hartmann, D. H. (Clemson Univ. SC, United States)