Electronic Telegram No. 2947
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011jb
     A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams,
California Institute of Technology; J. L. Prieto, Princeton University; M.
Catelan, Pontificia Universidad Catolica de Chile; E. C. Beshore and S. M.
Larson, Lunar and Planetary Laboratory, University of Arizona; and E.
Christensen, Gemini Observatory, 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).


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 December 21                 (CBET 2947)              Daniel W. E. Green