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Severe Constraints on Off-Axis GRB Jets in Type Ibc Supernovae From Late-Time Radio Observations | | A. M. Soderberg
; D. A. Frail
; M. H. Wieringa
; | | Date: |
6 Feb 2004 | | Journal: | Astrophys.J. 607 (2004) L13 | | Subject: | astro-ph | | Affiliation: | Caltech), D. A. Frail (NRAO) and M. H. Wieringa (ATCA | | Abstract: | It has been suggested that the peculiar properties of the luminous Type Ic supernova SN 1998bw and perhaps 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} < 4 x 10^{-7} solar masses per year (for a wind velocity v_w=1000 km/s) or the fraction of the shock energy in magnetic fields is epsilon_B < 10^{-3}. These values are unlikely based on observations of 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. | | Source: | arXiv, astro-ph/0402163 | | Services: | Forum | Review | PDF | Favorites | |
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