[IAUC] CBET 3393: 20130128 : SUPERNOVA 2013M IN ESO 325-G43 = PSN J13595668-3751494

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                                                  Electronic Telegram No. 3393
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 2013M IN ESO 325-G43 = PSN J13595668-3751494
     Stuart Parker, Canterbury, New Zealand, reports the discovery of an
apparent supernova (red mag 17.4) on a 30-s unfiltered CCD image (limiting mag
18.5) taken by himself on Jan. 20.671 UT with a 30-cm Astro-Tech AT12RC
Ritchey-Chretien astrograph (+ ST10 camera) at his Parkdale Observatory in the
course of the Backyard Observatory Supernova Search.  The new object is
located at R.A. = 13h59m56s.68, Decl. = -37d51'49".4 (equinox 2000.0;
reference stars from USNO-B and UCAC3 catalogues), which is 11" west of the
nucleus of the galaxy ESO 325-G43.  Nothing is visible at this position on
Digitized Sky Survey red and infrared images (limiting red magnitude > 19).
Nothing visible on a 30-s image taken by Parker on Jan. 6.583 (limiting red
magnitude > 18.5).  Parker has posted an image that can be viewed via website
URL http://tinyurl.com/bxep69a.  The variable was designated PSN
J13595668-3751494 when it was posted at the Central Bureau's TOCP webpage
and is here designated SN 2013M based on the spectroscopic confirmation
reported below.

     S. W. Jha and C. McCully, Rutgers University; A. Kniazev, South African
Astronomical Observatory and Southern African Large Telescope; E. Hsiao, Las
Campanas Observatory; and G. H. Marion, Harvard-Smithsonian Center for
Astrophysics, report that a spectrogram (range 380-920 nm) of PSN
J13595668-3751494 = SN 2013M, taken on Jan. 25.1 UT with the SALT 10-m
telescope (+ RSS), shows it to be a type-Ia supernova, about one week before
maximum light.  Adopting a recession velocity of 10479 km/s for ESO 325-G43
(Theureau et al. 1998, A.Ap. Suppl. 130, 333; via NED) yields an expansion
velocity of 13300 km/s from the minimum of the Si II 635.5-nm feature.
Cross-correlation with a library of supernova spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) yields
good matches to the normal type-Ia supernova 2007le at six days before
maximum light.


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                         (C) Copyright 2013 CBAT
2013 January 28                  (CBET 3393)              Daniel W. E. Green