[IAUC] CBET 3501: 20130427 : SUPERNOVA 2013bx = PSN J12472422+3232500

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                                                  Electronic Telegram No. 3501
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 2013bx = PSN J12472422+3232500
     Li Zhou, Xiaofeng Wang, and Juncheng Chen, Tsinghua University (THU); and
Tianmeng Zhang and Xu Zhou, National Astronomical Observatories of China
(NAOC), report the discovery of an apparent supernova (mag 19.8) on unfiltered
CCD images taken on Apr. 9.73 UT using the 0.6-m NAOC Schmidt telescope in the
course of the THU-NAOC Transient Survey (TNTS).  The new object is located at
R.A. = 12h47m24s.22, Decl. = +32d32'50".0 (equinox 2000.0), which is 2".7 west
and 3".0 south of the center of the galaxy SDSS J124724.37+323252.7.  Nothing
is visible at this position on archival images obtained on Jan. 5 (limiting
mag about 20.0) or on a Digitized Sky Survey image from the Palomar Sky
Survey.  The TNTS images are posted at the following website URL:
http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ12472422+3232500.png.  The
variable was designated PSN J12472422+3232500 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013bx based on the
spectroscopic confirmation reported below.

     J. M. Silverman, University of Texas; J. Vinko, University of Szeged; R.
Quimby, Kavli IPMU, University of Tokyo; and J. C. Wheeler and E. Chatzopoulos,
University of Texas, write that a spectrogram, obtained on Apr. 15.14 UT with
the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by
S. Odewahn, shows that PSN J12472422+3232500 = SN 2013bx is a type-Ia
supernova.  Correlation with a library of supernova spectra using the
"SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) indicates that 2013bx is a 1999aa-like (e.g., Garavini et al. 2004,
A.J. 128, 387) type-Ia supernova near maximum brightness.  After removal of
the host-galaxy recession velocity of 45700 km/s (from narrow emission lines),
the absorption minimum of the Si II 635.5-nm line is found to be blueshifted
by about 12600 km/s.


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                         (C) Copyright 2013 CBAT
2013 April 27                    (CBET 3501)              Daniel W. E. Green