Electronic Telegram No. 3951
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 2014cm IN PGC 61452 = PSN J18083060-5204114
     S. Parker, Canterbury, New Zealand, reports the discovery of an apparent
supernova (red mag 18.0) on a 30-s unfiltered CCD image (limiting mag 19)
taken on May 30.515 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. = 18h08m30s.60, Decl. =
-52d04'11".4 (equinox 2000.0; reference stars from USNO-B and UCAC4
catalogues), which is 1" west and 10" south of the nucleus of the galaxy
ESO 229-G8 = PGC 61452.  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 seen via website URL http://tinyurl.com/mpmn45d.  The variable
was designated PSN J18083060-5204114 when it was posted at the Central
Bureau's TOCP webpage and is here designated SN 2014cm based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes from J.
Brimacombe, Cairns, Australia, obtained remotely with a 41-cm RCOS telescope
(+ U9000 camera + luminance filter) located at the Warrumbungle Observatory,
Siding Spring:  June 6.57, 19.9 (position end figures 30s.61, 11".3; image
posted at URL https://www.flickr.com/photos/43846774@N02/14500704846/);
16.693, 20.2 (position end figures 30s.45, 11".5; image posted at website URL
https://www.flickr.com/photos/43846774@N02/14330189249/).

     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 that spectroscopic classification of PSN J18083060-5204114 =
SN 2014cm was obtained on June 11.55 UT via a 120-min exposure with the Wide
Field Spectrograph (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).  The spectrum indicates
that 2014cm is a type-II supernova about two months past maximum light.
Classification with SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) shows a
good match to SN 2004et at phase +71 days, and the preferred SNID redshift is
about 0.021, consistent with the apparent host galaxy, PGC 61452 (z = 0.0182;
Dressler 1991, Ap.J. Suppl. 75, 241).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 August 31                   (CBET 3951)              Daniel W. E. Green