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

Abstract

We present the results from a {\it Hubble Space Telescope/ACS} study of the supernovae associated with gamma-ray bursts 040924 ($z=0.86$) and 041006 ($z=0.71$). We find evidence that both GRBs were associated with a SN 1998bw-like supernova dimmed by $\sim 1.5$ and $\sim 0.3$ magnitudes, respectively, making GRB 040924 the faintest GRB-associated SN ever detected. We study the luminosity dispersion in GRB/XRF-associated SNe and compare to local Type Ibc supernovae from the literature. We find significant overlap between the two samples, suggesting that GRB/XRF-associated SNe are not necessarily more luminous nor produce more ${}^{56}$Ni than local SNe. Based on the current (limited) datasets, we find that the two samples may share a similar ${}^{56}$Ni production mechanism.

ApJ accepted (in press). Revised version. High-resolution figures available at http://www.astro.caltech.edu/~ams/GRB-SNe.html

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