[IAUC] CBET 3747: 20131211 : SUPERNOVA 2013hc IN PGC 61330 = PSN J18032459+7013306

Mar Dic 10 20:37:42 ART 2013

                                                  Electronic Telegram No. 3747
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 2013hc IN PGC 61330 = PSN J18032459+7013306
     G. N. Gray, Greenwood, NS, Canada; and D. J. Lane, Stillwater Lake, NS,
Canada, report their discovery of an apparent supernova (mag about 18.0) on an
unfiltered CCD image taken with a 0.36-m f/5.5 Schmidt-Cassegrain telescope on
Oct 30.179 UT.  The new object is located at R.A. = 18h3m24s.59, Decl =
+70o13'30".6 (equinox 2000.0), which is about 3" east and 7" north of the
nucleus of PGC 61330.  Nothing is visible at this position on numerous images
of the galaxy taken in the past two years (all with limiting magnitude fainter
than 18), nor is anything present on Digitized Palomar Sky Survey images.  The
variable was designated PSN J18032459+7013306 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013hc based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013hc:  Oct. 31.095, 17.6 (Doug Rich, Hampden, ME, U.S.A.; 0.41-m reflector +
ST9XE camera; position end figures 24s.53, 32".0); 31.720, 17.4 (Gianluca
Masi, Francesca Nocentini, and Patrick Schmeer; remotely using a 43-cm
telescope near Ceccano, Italy; position end figures 24s.49, 31".3); 31.905,
17.0 (Xavier Bros, Ager, Spain; 35-cm telescope; image posted at website URL
http://www.anysllum.com/PSN_PGC61330.jpg); Nov. 2.116, 18.8 (Joseph Brimacombe,
Cairns, Australia; remotely using a 51-cm RCOS telescope + STXL-6303 camera
located at the New Mexico Skies observatory near Mayhill, NM, U.S.A.; image
posted at website URL http://www.flickr.com/photos/43846774@N02/10664485274/;
position end figures 24s.58, 30".9); 5.99, 17.1 (Rich; position end figures
24s.52, 31".5).

     L. Tartaglia, L. Tomasella, S. Benetti, P. Ochner, A. Pastorello, E.
Cappellaro, M. Turatto, and N. Elias-Rosa, Osservatorio Astronomico di Padova,
Istituto Nazionale di Astrofisica, report that the optical spectrogram (range
340-820 nm; resolution 1.3 nm) of PSN J18032459+7013306 = SN 2013hc, obtained
on Dec. 7.74 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC), is
characterized by a blue continuum and the presence of a low-contrast H_alpha
emission feature that is consistent with the redshift of the host galaxy (CGCG
340-33; z = 0.0443, from Kararian et al. 1987, Astrofizica 26, 5; via NED).
The ejecta velocity, as measured from the H_alpha full-width-at-half-maximum,
is found to be about 3100 km/s.  These spectral characteristics suggest that
2013hc is a peculiar type-II supernova.  The Asiago classification spectra are
posted at website URL http://sngroup.oapd.inaf.it; classification was made via
GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry
2007, Ap.J. 666, 1024).


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

                         (C) Copyright 2013 CBAT
2013 December 11                 (CBET 3747)              Daniel W. E. Green