[IAUC] CBET 3499: 20130426 : SUPERNOVA 2013bv = PSN J08412128+5243303

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                                                  Electronic Telegram No. 3499
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 2013bv = PSN J08412128+5243303
     Kaicheng Zhang, 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 18.7)
on unfiltered CCD images taken on Apr. 9.51 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. = 8h41m21s.28, Decl. = +52d43'30".3 (equinox 2000.0),
which is 3".2 west and 5".8 north of the center of the galaxy SDSS
J084121.50+524324.4.  Nothing is visible at this position on archival images
obtained on 2012 Nov. 25 (limiting mag about 20.0) or on a Digitized Sky
Survey image from the Palomar Sky Survey.  The TNTS images are posted at URL
http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ08412128+5243303.png.  The
variable was designated PSN J08412128+5243303 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013bv based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013bv:  Apr. 13.818, 19.4 (Federica Luppi and Luca Buzzi, Varese, Italy;
0.38-m f/6.8 reflector; position end figures 21s.25, 29".9; image posted at
website URL http://www.astrogeo.va.it/pub/TOCP/PSN_J08412128+5243303.jpg);
15.157, 19.2 (Joseph Brimacombe, Cairns, Australia; remotely with a 51-cm
RCOS telescope + luminance filter at the New Mexico Skies observatory near
Mayhill, NM, U.S.A.; position end figures 21s.30, 30".3; image posted at
website URL http://www.flickr.com/photos/43846774@N02/8656787538/).

     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. 15.19 UT with
the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by
S. Odewahn, shows that PSN J08412128+5243303 = SN 2013bv is possibly a
broad-lined type-Ic supernova similar to SN 1998bw (e.g., Patat et al. 2001,
Ap.J. 555, 900), within a few days of maximum brightness.  The redshift of
the host galaxy, determined from narrow emission lines of H, He I, and [O
III], is 0.0877, yielding an absolute magnitude of about -19.2.  Given that
such supernovae are sometimes associated with long-duration gamma-ray bursts
(e.g., Woosley and Bloom 2006, Ann. Rev. Astron. Astrophys. 44, 507), a
search for a possibly corresponding GRB in the weeks prior to discovery
(Apr. 9) should be conducted.  Further observations of the supernova are
encouraged.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2013 CBAT
2013 April 26                    (CBET 3499)              Daniel W. E. Green