SIMBAD references

Blondin et al. add that a spectrum (range 350-740 nm) of 2008X (cf. CBET 1239), obtained as above on Feb. 8.43 UT by Calkins, shows it to be a type-II- plateau supernova 3-4 weeks past explosion. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2008X is most similar to the type-II-plateau supernova 2005cs at 3 weeks past explosion. Adopting a recession velocity of 1948 km/s for the host galaxy of 2008X (from The Updated Zwicky Catalog, http://tdc-www.harvard.edu/uzc/), the maximum absorption in the H_alpha line (rest 656.3 nm) is blueshifted by roughly 4000 km/s.