[IAUC] CBET 3378: 20130109 : SUPERNOVA 2013E IN IC 2532 = PSN J10000552-3414013

Mar Ene 8 19:36:40 ART 2013

                                                  Electronic Telegram No. 3378
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 2013E IN IC 2532 = PSN J10000552-3414013
     Stuart Parker, Canterbury, New Zealand, reports the discovery of an
apparent supernova (red mag 14.8) on a 30-s unfiltered CCD image (limiting mag
18.5) taken by himself on Jan. 4.58 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 (BOSS).  The new object is
located at R.A. = 10h00m05s.52, Decl. = -34d14'01".3 (equinox 2000.0;
reference stars from USNO-B and UCAC3 catalogues), which is 2" east and 19"
south of the nucleus of the galaxy IC 2532.  Nothing is visible at this
position on Digitized Sky Survey red and infrared images (limiting red
magnitude > 19).  An image of the new object can be seen via website URL
http://tinyurl.com/bf629tb.  The variable was designated PSN J10000552-3414013
when it was posted at the Central Bureau's TOCP webpage and is here designated
SN 2013E based on the spectroscopic confirmation reported below.  Additional
CCD magnitudes for 2013E:  Jan. 5.452, V = 15.0 (S. Kiyota, Tsukuba, Japan;
remotely with a 0.25-m f/3.4 astrograph + SBIG ST-10XME camera located at the
iTelescope.net observing site near Mayhill, NM, USA); 6.469, R = 14.0 (J.
Brimacombe, Cairns, Australia; remotely with a 51-cm RCOS telescope at the New
Mexico Skies Observatory near Mayhill; position end figures 05s.57, 00".7;
image posted at URL http://www.flickr.com/photos/43846774@N02/8360132374/).

     N. Morrell, E. Y. Hsiao, C. Contreras, and M. Phillips, Las Campanas
Observatory, on behalf of the Carnegie Supernova Project, report that an
optical spectrogram (range 355-960 nm) of PSN J10000552-3414013 = SN 2013E,
obtained on Jan. 6.16 UT with the 2.5-m du Pont telescope (+ WFCCD) at Las
Campanas Observatory, shows that this is a type-Ia supernova several days
before maximum brightness.  Comparison to other spectra with "Superfit"
(Howell et al. 2005, Ap.J. 634, 1190) results in an excellent match with SN
1999ee at 8 days before maximum light.  Assuming for the host galaxy (IC 2532)
the NED recession velocity of 2822 km/s (Theureau et al. 1998, A.Ap. Suppl.
130, 333), the minimum of the 635.5-nm Si II absorption appears to be
blueshifted by approximately 16000 km/s.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2013 CBAT
2013 January 9                   (CBET 3378)              Daniel W. E. Green