Supernova 2011jb

Report the discovery of an apparent supernova in unfiltered Catalina Sky Survey (CSS) images: SN 2011 UT R.A. (2000.0) Decl. Mag. 2011jb Nov. 28.45 11 37 04.80 +15 28 14.2 17.8 Nothing is visible at this position on a CSS image from June 12.19 UT (limiting mag 19.2). E. Kankare and S. Mattila, Tuorla Observatory, University of Turku; and A. Pastorello, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, report that a spectrum of SN 2011jb was obtained on Dec. 19.3 UT with the Nordic Optical Telescope (+ ALFOSC; range 320-910 nm). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) and "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383; available at https://gelato.tng.iac.es/login.cgi) suggest that 2011jb is a type-IIn supernova like SN 2002ic and SN 2005gj (see, e.g., Trundle et al. 2008, A.Ap. 483, L47), roughly 40-50 days after peak at z = 0.084. The authors further report that an image obtained with the NOT on the same date (Dec. 19) provides an R-band magnitude of about 17.6, corresponding to an absolute magnitude of about -20.3 (after correction for foreground extinction of A_R about 0.1, from NED) for SN 2011jb (assuming H_o = 70 km/s/Mpc)....