Fig. 3.

Comparison of the spectrum of SN 2003lw taken on Dec 20, 2003, ∼15 days (rest frame) after the burst and ∼3 days before the SN maximum in the Rc band (in light gray, Malesani et al. 2004) with the spectrum of SN 2012eb taken between Aug 1 and 2, 2012, 13.2 days after the burst (black line; shifted to the rest frames). The spectrum of SN 2003lw was taken from the Open Supernova Catalog data base (Guillochon et al. 2017). According to Mazzali et al. (2006), this implies that on Dec 20 the expansion velocity was 17 000 ± 1000 km s−1. The SN 2012eb spectrum shows a substantially higher blueshift. Both spectra are smoothed with a boxcar filter of 250 Å width. Flux densities are arbitrarily scaled.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.