Specific star formation rate (sSFR) vs. stellar mass. The sample of hosts of luminous (M_V <  −21) supernovae of Neill et al. (2011) (see their Fig. 3) is plotted together with N271 and the LMC (values from Westerlund 1997 and Harris & Zaritsky 2009) and a sample of about 60 000 SDSS-GALEX galaxies from Wyder et al. (2007) relying on stellar masses and SFRs deduced by Kauffmann et al. (2003) and Brinchmann et al. (2004). Clearly, N271 fits quite well to the “extreme” hosts although SN 2009Z was not a very luminous event.