Electronic Telegram No. 2710
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 2011ca IN NGC 4495 = PSN J12312490+2907500
     F. Ciabattari and E. Mazzoni, Borgo a Mozzano Italy, report the discovery
of an apparent supernova on unfiltered CCD images (limiting mag about 19)
obtained on Apr. 26.94 (when the object was at mag 17.2) and 27.88 UT (at mag
17.1) with a 0.5-m reflector.  The new object (which was designated PSN
J12312490+2907500 when posted on the Central Bureau's TOCP webpage and is
here designated SN 2011ca based on the spectroscopic report below) is located
at R.A. = 12h31m24s.94, Decl. = +29d07'50".6 (equinox 2000.0; astrometry with
respect to UCAC2 stars), which is 24" east and 20" south of the center of the
galaxy NGC 4495.  Additional magnitudes for 2011ca (via unfiltered CCD unless
otherwise noted, and via Ciabattari and Mazzoni unless otherwise noted):
1990 Jan. 29, [20.3 (Digitized Sky Survey; Palomar F plate); 1990 Mar. 23,
[20.3 (DSS; Palomar J plate); 2011 Apr. 5, [19.1; 28.190, 16.8 (Joseph
Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K
camera at the New Mexico Skies Observatory, Mayhill, NM, U.S.A.; position
end figures 25s.00, 50".9).  Brimacombe's image is posted at website URL
http://www.flickr.com/photos/43846774@N02/5668046246/.  Supernovae 1994S and
2010lo also appeared in NGC 4495.

     G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on
behalf of the CfA Supernova Group, reports that a spectrum (range 340-740 nm)
of PSN J12312490+2907500 = SN 2011ca was obtained on Apr. 30 UT by P. Berlind
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST).  Cross-
correlation with a library of supernova spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows
that the object is a type-Ic supernova about one week after maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 May 1                       (CBET 2710)              Daniel W. E. Green