Publication Date:
2015-07-25
Description:
We present optical and near-infrared photometry of GRB 140606B ( z = 0.384), and optical photometry and spectroscopy of its associated supernova (SN). The results of our modelling indicate that the bolometric properties of the SN ( M Ni = 0.4 ± 0.2 M , M ej = 5 ± 2 M , and E K = 2 ± 1 x 10 52 erg) are fully consistent with the statistical averages determined for other -ray burst (GRB)-SNe. However, in terms of its -ray emission, GRB 140606B is an outlier of the Amati relation, and occupies the same region as low luminosity ( ll ) and short GRBs. The -ray emission in ll GRBs is thought to arise in some or all events from a shock breakout (SBO), rather than from a jet. The measured peak photon energy ( E p 800 keV) is close to that expected for -rays created by an SBO ( 1 MeV). Moreover, based on its position in the M V , p -L iso, plane and the E K –β plane, GRB 140606B has properties similar to both SBO-GRBs and jetted-GRBs. Additionally, we searched for correlations between the isotropic -ray emission and the bolometric properties of a sample of GRB-SNe, finding that no statistically significant correlation is present. The average kinetic energy of the sample is $\bar{E}_{\rm K} = 2.1\times 10^{52}$ erg. All of the GRB-SNe in our sample, with the exception of SN 2006aj, are within this range, which has implications for the total energy budget available to power both the relativistic and non-relativistic components in a GRB-SN event.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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