Electronic Telegram No. 3579
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 2013du IN PGC 5154 = PSN J01241425-3443364
     Stuart Parker, Canterbury, New Zealand, reports his discovery of an
apparent supernova (red mag 18.5) on a 30-s unfiltered CCD image (limiting mag
19) taken by himself on June 23.740 UT with a 30-cm Astro-Tech AT12RC
Ritchey-Chretien astrograph (+ ST10 camera) at his Parkdale Observatory in the
course of the Backyard Observatory Supernova Search.  The new object is
located at R.A. = 1h24m14s.25, Decl. = -34d43'36".4 (equinox 2000.0; reference
stars from USNO-B and UCAC3 catalogues), which is 2" east and 1" south of the
nucleus of the galaxy PGC 5154 = MCG -6-4-23 = ESO 352-G69.  Nothing is
visible at this position on Digitized Sky Survey red and infrared images
(limiting red magnitude > 19).  Parker posted his discovery image at website
URL http://tinyurl.com/klxhk3v.  He then found pre-discovery images showing
the new object at mag 17.3 on May 7.757 and at mag 18.1 on June 11.671.  The
variable was designated PSN J01241425-3443364 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013du based on the
spectroscopic confirmation reported below.

     M. Childress, R. Scalzo, F. Yuan, and B. Schmidt, Australian National
University (ANU); and B. Tucker, ANU and University of California, Berkeley,
report on spectroscopic classification of PSN J01241425-3443364 = SN 2013du,
undertaken with the Wide Field Spectrograph (WiFeS; cf. Dopita et al. 2007,
Ap. Space Sci. 310, 255) on the ANU 2.3-m telescope at Siding Spring, using
the B3000/R3000 gratings (wavelength range 350-980 nm at 0.1-nm resolution).
A 40-min spectrogram of 2013du taken on July 4.76 UT shows clear signatures of
an old type-II supernova, particularly a broad P-Cyg H-alpha line with a very
strong emission component.  Classification with SNID (Blondin and Tonry 2007,
Ap.J. 666, 1024) shows good matches to type-IIP supernovae at late phases.
The best match is to SN 2005cs at 30 days and redshift of 0.019, consistent
with the redshift of the apparent host galaxy, PGC 5154 (z = 0.020174;
Theureau et al. 1998, A.Ap. Suppl. 130, 333).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 July 11                     (CBET 3579)              Daniel W. E. Green