Left panel: comparison between the early time GTC spectrum of ATLAS17aeu (acquired ∼3 days after the burst event and without removing the afterglow contribution) and the template (assuming a redshift ∼0.6 ± 0.1) of the well-studied Type Ib/c SN 2006aj (Pian et al. 2006) at a phase of ∼3 days after the burst event GRB 060218. Right panel: same assumption as for the left panel, using the template of the Type Ic SN 2003jd (Valenti et al. 2008) at a phase of about one day before B-maximum light.
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