[IAUC] CBET 3665: 20131003 : SUPERNOVA 2013fq = PSN J19590795-5555466

Mie Oct 2 20:01:01 ART 2013

                                                  Electronic Telegram No. 3665
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 2013fq = PSN J19590795-5555466
     Stuart Parker, Canterbury, New Zealand, reports the discovery of an
apparent supernova (red mag 15.3) on a 30-s unfiltered CCD image (limiting mag
18.0) taken on Sept. 15.478 UT with a 35-cm f/6.3 Celestron C14 reflector (+
ST10 camera) at the Parkdale Observatory in the course of the Backyard
Observatory Supernova Search.  The new object is located at R.A. =
19h59m07s.95, Decl = -55d55'46".6 (equinox 2000.0; reference stars from USNO-B
and UCAC4 catalogues), which is 13" east and 5" south of the nucleus of the
presumed host galaxy.  Nothing is visible at this position on Digitized Sky
Survey red and infrared images (limiting red magnitude > 19).  An image has
been posted at website URL http://tinyurl.com/kz2xyjs.  The variable was
designated PSN J19590795-5555466 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2013fq based on the spectroscopic
confirmation reported below.  Additional CCD magnitudes for 2013fq:  Sept.
19.540, V = 16.1 (S. Kiyota, Kamagaya, Japan; images taken remotely using an
iTelescope 0.50-m f/6.8 astrograph + FLI-PL09000 camera at Siding Spring;
image posted at URL http://meineko.sakura.ne.jp/ccd/PSN_J19590795-5555466.jpg);
19.614, 15.7 (J. Brimacombe, Cairns, Australia; 41-cm RCOS telescope + STL6K
camera + infrared filter; bandpass > 700 nm; position end figures 07s.90,
46".7; image posted at http://www.flickr.com/photos/43846774@N02/9830381746/).

     M. Childress, R. Scalzo, F. Yuan, and B. Schmidt, Australian National
University (ANU); and B. Tucker, ANU and University of California at Berkeley,
report spectroscopic classification of PSN J19590795-5555466 = SN 2013fq with
the Wide Field Spectrograph WiFeS; cf. Dopita et al. 2007, Ap. Space Sci. 310,
255) on the ANU 2.3-m telescope at Siding Spring Observatory, using the
B3000/R3000 gratings (wavelength range 350-980 nm at 0.1-nm resolution), from
a 40-min WiFeS spectrogram obtained on Sept. 19.  The spectrum indicates that
2013fq is a type-IIb supernova, with clear P-Cyg H_alpha and H_beta features,
as well as typical helium lines such as He I 587.5-nm.  Classification with
SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) shows best matches to SN 1997dd
at phase 0.  Narrow emission lines from the host galaxy indicate the redshift
to be z = 0.0113.

     E. Y. Hsiao, Y. Beletsky, and M. M. Phillips, Las Campanas Observatory;
and G. H. Marion, University of Texas at Austin, report the spectroscopic
classification of PSN J19590795-5555466 = SN 2013fq using a near-infrared
spectrogram (range 800-2400 nm) obtained with the FoldedPort Infrared
Echellette (FIRE) spectrograph on the 6.5-m Magellan Baade Telescope on Sept.
18.0 UT.  The spectrum of 2013fq is most similar to that of the type-IIb
supernova SN 2008ax near maximum (Chornock et al. 2011, Ap.J. 739, 41) at an
approximate redshift of 0.02.  Several near-infrared He I P-Cyg profiles are
present, but the presence of near-infrared H I features is inconclusive.


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                         (C) Copyright 2013 CBAT
2013 October 3                   (CBET 3665)              Daniel W. E. Green