An HST Study of the Supernovae Accompanying GRB 040924 and GRB 041006

The authors are grateful for support under the Space Telescope Science Institute grant HST-GO-10135. A. M. S. acknowledges support by the NASA Graduate Student Researchers Program. E. B. is supported by NASA through Hubble Fellowship grant HST-HF-01171.01 awarded by the STScI, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. A. G. acknowledges support by NASA through Hubble Fellowship grant HST-HF- 01158.01-A awarded by STScI. K. R. is supported by the Gemini Observatory, which provided observations presented in this paper, and which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).