[IAUC] CBET 2955: 20111228 : SUPERNOVA 2011jj IN PGC 5364 = PSN J01263180+3137026

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                                                  Electronic Telegram No. 2955
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 en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011jj IN PGC 5364 = PSN J01263180+3137026
     S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski,
A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology;
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 public images from the Catalina Sky Survey (CSS):

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011jj   Dec. 1.09    1 26 31.80  +31 37 02.6   19.8    23".0 W, 3".8 N

Note that the position is close to SN 2011ix (cf. CBET 2942), which is also
seen in some of the follow-up CSS images.  The variable was designated PSN
J01263180+3137026 when it was posted at the Central Bureau's TOCP webpage and
is here designated SN 2011jj based on the spectroscopic confirmation reported
below.  Additional magnitudes for 2011jj (unfiltered unless noted otherwise):
Sept. 22.24 UT, [20.2 (CSS); Oct. 16.183, 19.1 (Joseph Brimacombe, Cairns,
Australia; remotely using a 51-cm RCOS telescope + STL11K camera + luminance
filter at the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; position
end figures 31s.76, 02".8); 18.22, 19.3 (CSS); 24.33, 19.5 (CSS); Nov.
1.25, 19.3 (CSS); 1.403, 19.4 (Brimacombe; position end figures 31s.82,
02".8); Dec. 18.213, 19.5 (Brimacombe; position end figures 31s.80, 03".0).
Brimacombe's Oct. 16 image is posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/6536985993/; his Nov. 1 image is
posted at http://www.flickr.com/photos/43846774@N02/6539516343/; and his Dec.
18 image is posted at http://www.flickr.com/photos/43846774@N02/6536691675/.

     L. Tomasella, S. Valenti, S. Benetti, F. Bufano, M. Fiaschi, A.
Pastorello, and P. Ochner, Osservatorio Astronomico di Padova, Istituto
Nazionale di Astrofisica, on behalf of a larger collaboration, report that a
spectrogram of PSN J01263180+3137026 = SN 2011jj, obtained on Dec. 23.77 UT
with the Asiago 1.82-m Copernico Telescope (+ AFOSC; range 350-820 nm;
resolution 2.4nm), suggests that it is a type-IIP supernova around 50 days
after explosion.  Cross-correlation with a library of supernova spectra via
the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) indicates that 2011jj is similar to SN 2004et (Maguire et al. 2010,
MNRAS 404, 981).


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

                         (C) Copyright 2011 CBAT
2011 December 28                 (CBET 2955)              Daniel W. E. Green