Electronic Telegram No. 3547
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 2013cz IN IC 4892 = PSN J19493251-7013200
     Stuart Parker, Canterbury, New Zealand, reports the discovery of an
apparent supernova (red mag 17.9) on a 30-s unfiltered CCD image (limiting
mag 18.5) taken by himself on May 7.60 UT with a 35-cm Celestron C14 reflector
(+ ST10 camera) at the Parkdale Observatory in the course of the Backyard
Observatory Supernova Search.  The new object is located at R.A. =
19h49m32s.51, Decl. = -70d13'20".0 (equinox 2000.0; reference stars from
USNO-B and UCAC4 catalogues), which is 4" east and 19" north of the nucleus
of the galaxy IC 4892.  Nothing is visible at this position on Digitized
Sky Survey red and infrared images (limiting red magnitude > 19).  Parker
posted an image of the variable at website URL http://tinyurl.com/copy6gb.
The variable was designated PSN J19493251-7013200 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013cz based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013cz:  Apr. 23.625, [18.5 (Parker); May 14.643, 17.5 (P. Camilleri and H.
Williams, Leura, NSW, Australia; 0.61-m f/6.3 Planewave CDK reflector + SBIG
ST-8300M camera; position end figures 32s.54, 20".1); 14.782, 17.9 (Joseph
Brimacombe, Cairns, Australia; 41-cm telescope + infrared filter; bandpass
> 700 nm; position end figures 32s.90, 19".2; images posted at website URL
http://www.flickr.com/photos/43846774@N02/8865248622/).

     M. Childress, R. Scalzo, B. Tucker, F. Yuan, and B. Schmidt, Australian
National University (ANU), report on spectroscopy of PSN 19493251-7013200 =
SN 2013cz obtained on June 3.69 UT with the Wide Field Spectrograph (WiFeS;
Dopita et al. 2007, Ap. Space Sci. 310, 255) on the ANU 2.3-m telescope (+
B3000/R3000 gratings; range 350-980 nm, 0.1-nm resolution) at Siding Spring
Observatory.  A 40-min spectrum of the supernova shows clear P-Cyg H-alpha
absorption, as well as H-beta, the Ca II infrared triplet, Fe II 501.8-nm,
and Fe II 516.9-nm.  Classification via SNID (Blondin and Tonry 2007, Ap.J.
666, 1024) shows good matches to SN 2005cs at +13 days, SN 2004et at +20
days, and SN 2006bp at +20 days.  The mean redshift from SNID is about 0.015,
consistent with the redshift of the apparent host galaxy (IC 4892; z =
0.013733, via Mathewson et al. 1992, Ap.J. Suppl. 81, 413).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 June 9                      (CBET 3547)              Daniel W. E. Green