Velocity evolution of broad-lined type-Ic supernovae with and without gamma-ray bursts

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Table 2.

Median Fe II and Si II decay indices for GRB-SNe and ordinary type Ic-BL SNe in the Gold sample.

	GRB-SNe	Type Ic-BL SNe
Fe II	$- 0 . 27_{- 0.27}^{+ 0.04}$ ${-0.27_{-0.27}^{+0.04}}$	$- 0 . 30_{- 0.25}^{+ 0.09}$ ${-0.30_{-0.25}^{+0.09}}$
Si II	$- 0 . 4_{- 0.3}^{+ 0.2}$ ${-0.4_{-0.3}^{+0.2}}$	$- 0 . 6_{- 0.2}^{+ 0.3}$ ${-0.6_{-0.2}^{+0.3}}$

Notes. The quoted uncertainties are derived from the 16th and 84th percentiles. No value is reported for type Ic SNe, since the Gold sample only has one instance of a type Ic SN.

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