Electronic Telegram No. 3572

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


SUPERNOVA 2013dp IN UGC 10313 = PSN J16173231+3134572
     A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams,
California Institute of Technology; J. L. Prieto, Princeton University; M.
Catelan, Pontificia Universidad Catolica de Chile; and S. M. Larson and E.
Christensen, Lunar and Planetary Laboratory, University of Arizona, report the
Catalina Real-time Transient Survey discovery of an apparent supernova in
unfiltered Catalina Sky Survey (CSS) images:

 SN       2013 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2013dp   June 10.37   16 17 32.31  +31 34 57.2   16.3    12".2 W, 18".0 N

The variable was designated PSN J16173231+3134572 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013dp based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013dp (unfiltered unless noted otherwise):  June 11.229 UT, 16.3 (Joseph
Brimacombe, Cairns, Australia; remotely with a 51-cm telescope + STL11K
camera + luminance filter located at the New Mexico Skies observatory near
Mayhill, NM, USA; position end figures 32s.30, 56".7; image posted at website
URL http://www.flickr.com/photos/43846774@N02/9021730605/); 12.911, 16.3 (S.
Foglia and G. Galli, Pogliano Milanese, Italy; 0.28-m f/6.8 reflector +
ST8XME camera; UCAC-4 reference stars; position end figures 32s.28, 56".6);
12.999, 16.3 (Federica Luppi and Luca Buzzi, Varese, Italy; 0.35-m reflector;
position end figures 32s.30, 56".7; reference stars from CMC-14 catalogue;
image posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_U10313.jpg);
15.914, 16.2 (Xavier Bros, Ager, Spain; 35-cm telescope; position end figures
32s.29, 56".7; UCAC2 reference stars; image posted at website URL
http://anysllum.com/PSN_UGC10313.jpg); 16.027, 15.9 (Gianluca Masi and
Francesca Nocentini, Ceccano, Italy; 43-cm telescope; position end figures
32s.31, 56".6; UCAC-4 reference stars); 18.34, 15.5 (CSS); 28.27, 15.8 (CSS).

     S. Tinyanont, Harvey Mudd College; Y. Cao, California Institute of
Technology; and M. M. Kasliwal, Observatories of the Carnegie Institution and
Princeton University, report that spectroscopic observations (range 330-1000
nm) of PSN J16173231+3134572 = SN 2013dp were obtained on June 27.26 UT with
the Dual Imaging Spectrograph on the 3.5-m ARC telescope at Apache Point
Observatory.  The spectrum shows a prominent Si II absorption at 628.3 nm.
Using the redshift z = 0.022322 for UGC 10313 (from Schneider et al. 1990,
Ap.J. Suppl. 72, 245; via NED), this corresponds to a velocity of 10100 km/s.
Using the SNID software, the spectrum resembles SN 2004eo at two days after
maximum, indicating that 2013dp is a type-Ia supernova.


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

                         (C) Copyright 2013 CBAT
2013 July 2                      (CBET 3572)              Daniel W. E. Green