Electronic Telegram No. 3561

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

SUPERNOVAE 2013dh IN NGC 5936

< BET 3422, S. Kumar, K. Fuller, W. Zheng, S. B. Cenko, W. Li,
and A. V. Filippenko report the LOSS discovery of an apparent supernova on
unfiltered KAIT images:

 SN       2013 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2013dh   June 12.33   15 30 01.09  +12 59 12.9   18.0    3".7 E, 8".6 N

The variable was designated PSN J15300109+1259129 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013dh based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013dh:  June 9.35 UT, [18.5 (KAIT); 12.931, 16.5 (S. Foglia and G. Galli,
Pogliano Milanese, Italy; 0.28-m Schmidt-Cassegrain reflector + ST8XME
camera; UCAC-4 reference stars; position end figures 01s.11, 12".8); 13.593,
18.4 (Joseph Brimacombe, Cairns, Australia; 41-cm telescope + infrared filter;
bandpass > 700 nm; position end figures 01s.09, 13".0; image posted at website
URL http://www.flickr.com/photos/43846774@N02/9043487561/).

     S. B. Cenko, Goddard Space Flight Center, NASA; B. E. Tucker, Australian
National University; and I. Shivvers, K. I. Clubb, and A. V. Filippenko,
University of California, Berkeley, report that inspection of a CCD spectrum
(range 350-1000 nm), obtained on June 14.3 UT with the Shane 3-m reflector (+
Kast spectrograph) at Lick Observatory, shows that PSN J15300109+1259129 = SN
2013dh is a type-Ia supernova.  Cross-correlation with a library of supernova
spectra using the "SuperNova Identification" code (SNID; Blondin and Tonry
2007, Ap.J. 666, 1024) indicates a similarity with pre-maximum-light spectra
of SN 1991T (Filippenko et al. 1992, Ap.J. 384, L15), with a blue continuum
and relatively weak Si II 635.5-nm absorption.
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Host galaxy info: vel= 4004 km/s ; 1.4" x 1.3"; 13.11; SB(rs)b;LIRG HII          

SN type info: Ia-91T

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