Electronic Telegram No. 3573
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 2013dq IN UGC 525 = PSN J00513484+2943149
     S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski,
A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology;
J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad
Catolica de Chile; and E. Christensen and S. M. Larson, Lunar and Planetary
Laboratory, University of Arizona, report the Catalina Real-time Transient
Survey discovery of an apparent supernova in public images from the Catalina
Sky Survey (CSS).

 SN       2013 UT       R.A. (2000.0) Decl.       Mag.      Offset
 2013dq   June 27.44   0 51 34.84  +29 43 14.9   16.8    4".3 E, 15".6 N

The variable was designated PSN J00513484+2943149 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013dq based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013dq:  Feb. 8.14 UT, [19.5 (CSS); June 28.814, 17.2 (Joseph Brimacombe,
Cairns, Australia; 41-cm telescope + infrared filter; bandpass > 700 nm;
position end figures 35s.02, 13".8; image posted at website URL
http://www.flickr.com/photos/43846774@N02/9174594184/).

     A. A. Rachubo and D. C. Leonard, San Diego State University; K. Follette,
P. Sheehan, V. Bailey, and D. McCarthy, University of Arizona; J. Moustakas,
Siena College; J. Barrows, E. Bosset, E. Buckley, D. Burd, J. Calahan, I.
Ceesay, E. Douglas, C. Feeney, T. Fornari, A. Fox, H. Fishwick, H. Gano, C.
Green, J. Griggs, K. Hart, S. Hart, K. Hartman, A. Holt, E. Hooper, S. Hume,
S. Jaeggli, D. Lesser, M. Kerr, C. Kopans-Johnson, K. Kumar, A. Lackey, S.
Laube, E. Marshall, M. Martinez, G. Mehta, K. Melbourne, M. Meshel, C. Myers,
E. Puranen, A. Schlingman, W. Schlingman, W. M. Schlingman, K. Shen, N. Stock,
C. Stillman, J. Tinker, and B. Whitesell, 2013 Advanced Teen Astronomy Camp,
report that inspection of a low-dispersion optical spectrogram (range 370-680
nm) of PSN J00513484+2943149 = SN 2013dq, obtained in heavy twilight with
the 2.3-m Bok telescope (+ Boller & Chivens spectrograph) at Steward
Observatory on June 28 UT, shows it to be an aging type-Ia supernova.  After
correcting for a redshift of 4931 km/s for the assumed host galaxy, UGC 525
(Falco et al. 1999, PASP 111, 438; via NED), reasonable matches are found with
normal type-Ia supernovae at epochs ranging between 40 and 65 days after
maximum light, although there is a notable absence of emission in 2013dq near
500.0 nm (attributed to Fe II; Branch et al. 2008, PASP 120, 135) that is
usually seen at this phase.  The most convincing individual spectral match is
made with SN 1999gp at 50 days post-maximum (Matheson et al. 2008, A.J. 135,
1598), which exhibited a broad, 1991T-like light-curve (dm15[B] = 0.80;
Hicken et al. 2009, Ap.J. 700, 331), a "shallow silicon" maximum-light
spectrum (Jha et al. 2000, IAUC 7341; Branch et al. 2009, PASP 121, 238), and
somewhat-muted 500.0-nm emission at this phase.


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 3573)              Daniel W. E. Green