Constraints on Off-Axis GRB Jets in Type Ibc Supernovae From Late-Time Radio Observations

Abstract

It has been suggested that the peculiar properties of the luminous Type Ic supernova SN 1998bw and its low-energy gamma-ray burst GRB 980425 may be understood if they originated in a standard gamma-ray burst explosion viewed far from the axis of the relativistic jet. In this scenario, strong radio emission is predicted from the jet on a timescale 1 to 10 years after the explosion as it decelerates and spreads into our line of sight. To test this hypothesis we have carried out late-time radio observations of SN 1998bw at $t=5.6$ years, yielding upper limits which are consistent with the continued fading of the supernova. We find these limits to be consistent with an off-axis jet only if the progenitor mass loss rate is $\dot{M}\lesssim 4\times 10^{-7}$ M${}_{\odot }$ yr${}^{-1}$ (for a wind velocity $v_w=1000$ km s${}^{-1}$) or the fraction of the shock energy in magnetic fields is ${\epsilon }_B\lesssim 10^{-3}$. These values are low relative to those inferred for cosmological GRBs. We combine the SN 1998bw measurements with existing observations for a sample of 15 local Type Ibc supernovae to estimate that at most 6% produce collimated, relativistic outflows.

Revised version, as it appears in ApJL

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