2011CBET.2870....2O

P. Ochner, S. Valenti, S. Benetti, A. Pastorello, and L. Tomasella, Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Padova; and F. Bufano, INAF, Osservatorio Astronomico di Catania, on behalf of a larger collaboration, report that a spectrum of TCP J05060576-4503003 = SN 2011gx, obtained on Oct. 18.17 UT with the New Technology Telescope (+ EFOSC2; range 360-930 nm; resolution 1.8 nm) shows it to be a type-II supernova. The best fit to this spectrum found by GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; publicly available at https://gelato.tng.iac.es) is with spectra of type- II-plateau supernovae at about one month post-explosion. Together with the classical P-Cyg Balmer features, prominent lines of Ca II, Fe II, and Na I D are detected. Adopting a recessional velocity of 9821 km/s for ESO 252-G10 (Lauberts and Valentijn, 1989, THE SURFACE PHOTOMETRY CATALOGUE OF THE ESO- UPPSALA GALAXIES, European Southern Obsrvatory) the expansion velocity deduced from the H_alpha absorption is about 8000 km/s.