Electronic Telegram No. 3614
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 2013eo = PSN J20065788-5625312
     Peter Marples and Greg Bock report the discovery of an apparent supernova
(red mag 17.4) on a 30-s unfiltered CCD image (limiting mag 17.5) taken by
Marples on July 31.50 UT with a 30-cm Meade LX200R f/7 reflector (+ SXV-H9
Starlight Xpress camera) at Loganholme, Queensland, Australia, in the course
of the Backyard Observatory Supernova Search (BOSS).  The new object is
located at R.A. = 20h06m57s.88, Decl. = -56d25'31".2 (equinox 2000.0;
reference stars from USNO-B and UCAC4 catalogues), which is 12".6 east and
13".2 south of the nucleus of the galaxy PGC 161935.  Nothing is visible at
this position on Digitized Sky Survey red and infrared images (limiting red
magnitude > 19).  The variable was designated PSN J20065788-5625312 when it
was posted at the Central Bureau's TOCP webpage and is here designated SN
2013eo based on the spectroscopic confirmation reported below.  Bock found a
pre-discovery unfiltered BOSS CCD image of 2013eo when it was at mag 18.0 on
July 26.50 (taken by himself at Windaroo, Queensland, Australia; limiting mag
18.4).

     M. Childress, R. Scalzo, F. Yuan, and B. Schmidt, Australian National
University (ANU); and B. Tucker, ANU and University of California at Berkeley,
report on spectroscopy (wavelength range 350-980 nm at 0.1-nm resolution) of
PSN J20065788-5625312 = SN 2013eo taken on July 31.63 UT 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, using the B3000/R3000 gratings.  The
spectrum indicates that 2013eo is a type-Ia supernova around maximum light.
Classification with SNID software (Blondin and Tonry 2007, Ap.J. 666, 1024)
shows a best match to SN 1994D at -2 days at a redshift of 0.050 +/- 0.006,
consistent with the redshift of the apparent host galaxy (2MASX
J20065644-5625175; z = 0.051946 after Jones et al. 2009, MNRAS 399, 683).
Clear type-Ia-supernova signatures include Si II 635.5-nm at a rest-frame
velocity of 12000 km/s (using the host redshift), Si II 597.2-nm, the S II
'W' feature, O I 770.0-nm, Ca H and K, and the Ca II near-infrared triplet.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 August 2                    (CBET 3614)              Daniel W. E. Green