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Fig. 6

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GRB 130215A/SN 2013ez: SN+host+AG (blue) rest-frame spectrum (λ in air), from tt0 = 25.8 d (16.1 d rest-frame). Top: the spectrum in blue has been median filtered (width of 20 Å), while the red spectrum has been smoothed using a Kaiser window (M = 40, β = 0). Clear undulations are seen in the spectrum that are reminiscent of other SNe Ic. Bottom left: close-up of the absorption feature near 5100 Å, which is thought to be blueshifted FeII λ5169. Both a single and double Gaussian have been fitted to the smoothed spectrum. The latter provides a better fit (λ1 = 5100.59 ± 24.45 Å, vFe = −4000 ± 1496 km s-1; λ2 = 5305.72 ± 202.17 Å, which is too red to be Fe ii λ5169). Bottom right: close-up of the absorption feature near 6200 Å, which is thought to be blueshifted Si ii λ6355. A single Gaussian was fit to the spectrum, yielding λ1 = 6221.75 ± 16.77 Å, vFe = −6354 ± 808 km s-1. A double Gaussian was also fitted to the smoothed spectrum, however an improved fit was not obtained. The blueshifted velocities of both lines are comparable within their respective error bars, and show that SN 2013ez may be more appropriately classified as a type Ic SN than as a type Ic-BL.

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