Electronic Telegram No. 2722
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 2011ck IN NGC 5425 = PSN J14004624+4826454
     J. Newton and T. Puckett report the discovery of an apparent supernova
(mag 15.9) on an unfiltered CCD image (limiting mag 18.9) taken with a 0.35-m
reflector at Portal, AZ, U.S.A., on May 12.291 UT in the course of the Puckett
Observatory Supernova Search.  The new object (which was designated PSN
J14004624+4826454 when posted on the Central Bureau's TOCP webpage and is here
designated SN 2011ck based on the spectroscopic report below) is located at
R.A. = 14h00m46.24, Decl. = +48o26'45".4 (equinox 2000.0), which is 14".8 west
and 7".3 north of the center of NGC 5425.  Additional approximate unfiltered
CCD magnitudes for 2011ck:  1989 Mar. 26, [19.5 (red Digitized Sky Survey
image; via Zhangwei Jin, Ningbo, Zhejiang, China; and Xing Gao, Urumqi,
Xinjiang, China); 2010 Mar. 11, [19.1 (Puckett); 2011 Apr. 24, [19.0 (Jin and
Gao; 0.35-m reflector at Mt. Nanshan); Apr. 27, [17.5 (Jin and Gao); May
13.294, 15.9 (Puckett); 13.844, 16.6 (Jin and Gao; limiting mag about 19.5;
independent discovery; reported after Puckett's TOCP posting; position end
figures 46s.32, 46".4; offset 16" west, 8" north from the center of NGC 5425);
14.354, 17.2 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm
RCOS telescope + STL11K camera at New Mexico Skies Observatory, Mayhill, NM,
U.S.A.; position end figures 46s.30, 45".6).  Jin and Gao have posted an
image of 2011ck at website URL http://www.xjltp.com/XOSS/XM21ZJ/XM21ZJ.htm.
Brimacombe has posted his image at the following website URL:
http://www.flickr.com/photos/43846774@N02/5721977398/.

     G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA) and
University of Texas; J. Vinko, University of Szeged; and J. C. Wheeler,
University of Texas, report that a spectrum (range 430-1000 nm) of PSN
J14004624+4826454 = SN 2011ck was obtained by S. Odewahn on May 17 UT with
the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph).
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-IIP supernova at two to three weeks after the
explosion.  The redshift is estimated to be z = 0.0065, measured from host-
galaxy emission lines.  The centroid of the emission component of the H-alpha
feature is blueshifted by about 4000 km/s, and it is much stronger than the
absorption component.  The velocity of the H-alpha feature, measured at the
absorption minimum, is estimated to be approximately 16000 km/s.


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

                         (C) Copyright 2011 CBAT
2011 May 19                      (CBET 2722)              Daniel W. E. Green