[IAUC] CBET 3770: 20140104 : SUPERNOVA 2013hs IN UGC 1461 = PSN J01585369+0535254

Vie Ene 3 20:50:37 ART 2014

                                                  Electronic Telegram No. 3770
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 2013hs IN UGC 1461 = PSN J01585369+0535254
     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), the discovery observation tabulated below:

 SN       2013 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2013hs   Dec. 25.13   1 58 53.69  + 5 35 25.4   15.8    4".3 E, 12".5 S

The variable was designated PSN J01585369+0535254 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013hs based on the
spectroscopic confirmation reported below.  Further CCD magnitudes for 2013hs:
2013 Nov. 7.30 UT, [20.0 (CSS); Dec. 26.179, V = 15.57, I_c = 16.14 (Seiichiro
Kiyota, Kamagaya, Japan; remotely with a 0.50-m f/6.8 astrograph + FLI ProLine
PL11002M camera located near Mayhill, NM, USA; position end figures 53s.79,
26".7; reference stars from UCAC3 catalogue; V-band images posted at website
URL http://meineko.sakura.ne.jp/ccd/PSN_J01585369+0535254-V.jpg); 26.218, 15.6
(Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope +
STXL-6303 camera at the New Mexico Skies observatory near Mayhill; position
end figures 53s.65, 23".5); 28.197, 15.8 (Brimacombe; image posted at website
URL http://www.flickr.com/photos/43846774@N02/11638440506/).

     Tianmeng Zhang, National Astronomical Observatories of China (NAOC); and
Xulin Zhao and Xiaofeng Wang, Tsinghua University, report on an optical
spectrogram (range 370-860 nm) of PSN J01585369+0535254 = 2013hs that was
obtained on 2013 Dec. 27.58 UT with the 2.16-m telescope (+ BFOSC) at the
Xinglong Station of the NAOC.  The spectrum is consistent with that of a
type-Ia supernova about one week after maximum light.  Cross-correlation with
a library of supernova spectra using the "Supernova Identification" code
(SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2013hs matches
with SN 1999ef at +8 days.  Adopting for the host galaxy (UGC 1461) a
recession velocity of 5831 km/s (from Springob et al. 2005, Ap.J. Supp. 160,
149), they measure the velocity of the Si II 635.5-nm absorption feature to
be about 10000 km/s.

     E. Y. Hsiao, M. M. Phillips, and N. Morrell, Las Campanas Observatory;
G. H. Marion, University of Texas, Austin; C. Contreras, C. Gall, and M. D.
Stritzinger, Aarhus University; and R. P. Kirshner, Harvard-Smithsonian Center
for Astrophysics, report on the spectroscopic classification of PSN
J01585369+0535254 = SN 2013hs using a near-infrared spectrogram (range
800-2500 nm) obtained on Dec. 27.05 UT with the FoldedPort Infrared Echellette
(FIRE) spectrograph on the 6.5-m Magellan Baade Telescope at Las Campanas
Observatory.  The near-infrared spectrum shows that 2013hs is a type-Ia
supernova.  The spectrum resembles the near-infrared spectrum of SN 2011fe at
eight days past maximum (Hsiao et al. 2013, Ap.J. 766, 72).  The supernova
redshift approximately matches the redshift of the presumed host galaxy (UGC
1461) at z = 0.01945 (Giovanelli et al. 1997, A.J. 114, 122).

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

                         (C) Copyright 2014 CBAT
2014 January 4                   (CBET 3770)              Daniel W. E. Green