[IAUC] CBET 3958: 20140902 : SUPERNOVA 2014ct IN PGC 28871 = PSN J09592516-0015192

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3958
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 2014ct IN PGC 28871 = PSN J09592516-0015192
     S. Parker, Canterbury, New Zealand, reports the discovery of an apparent
supernova (red mag 18.7) on a 30-s unfiltered CCD image (limiting mag 19)
taken on June 1.313 UT with a 35-cm Celestron C14 reflector (+ ST10 camera) at
his Parkdale Observatory in the course of the Backyard Observatory Supernova
Search.  The new object is located at R.A. = 9h59m25s.16, Decl. = -0d15'19".2
(equinox 2000.0; reference stars from USNO-B and UCAC4 catalogues), which is
15" west and 5" south of the nucleus of the galaxy PGC 28871.  Nothing is
visible at this position on Digitized Sky Survey red and infrared images
(limiting red magnitude > 19).  An image of the variable can be viewed via
website URL http://tinyurl.com/ljwkqdf.  The variable was designated PSN
J09592516-0015192 when it was posted at the Central Bureau's TOCP webpage and
is here designated SN 2014ct based on the spectroscopic confirmation reported
below.  G. Masi writes that unfiltered images taken on June 2.826 with a
43-cm telescope at Ceccano, Italy, show 2014ct at mag 18.7 and position end
figures 25s.11, 18".7.

     M. Childress, C. Owen, R. Scalzo, F. Yuan, and B. Schmidt, Australian
National University (ANU); and B. Tucker, ANU and University of California at
Berkeley, report on spectroscopic classification of PSN J09592516-0015192 = SN
2014ct via a 120-min spectrogram that was obtained on June 12.35 UT with the
Wide Field Spectrograph (cf. Dopita et al. 2007, Ap. Space Sci. 310, 255)
using the ANU 2.3-m telescope at Siding Spring with the B3000/R3000 gratings
(wavelength range 350-980 nm at 0.1-nm resolution).  The spectrum indicates
that 2014ct is a type-Ia supernova about a month past maximum light.
Classification with SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) shows a
good match to SN 2004eo at phase +24 days, and the preferred SNID redshift
is about 0.048, consistent with the apparent host galaxy, PGC 28871 (z =
0.0480; Beers et al. 1995, A.J. 109, 874).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 September 2                 (CBET 3958)              Daniel W. E. Green