[IAUC] CBET 3377: 20130108 : SUPERNOVA 2013D

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3377
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 2013D
     Vladimir Lipunov, Sternberg Astronomical Institute, reports the
discovery by Pavel Balanutsa via the MASTER-Kislovodsk auto-detection system
of a possible supernova (mag 17.5) on on four unfiltered images (limiting mag
19.8) taken on Jan. 3.82 UT.  The new object is located at R.A. = 3h41m15s.13,
Decl. = +15d23'03".9 (equinox 2000.0).  Nothing is visible at this position
on a MASTER image taken on 2010 Dec. 3.8 (limiting mag 20.5).  The discovery
and reference MASTER images have been posted at the following website URL:
http://observ.pereplet.ru/images/034115.13152303.9.png.

     G. H. Marion and P. Challis, Harvard-Smithsonian Center for Astrophysics
(CfA), on behalf of the CfA Supernova Group, report that a spectrogram (range
340-740 nm) of 2013D was obtained on Jan. 6 UT by P. Berlind with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST).  Cross-correlation with a
library of supernova spectra using the "Supernova Identification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2013D is a type-Ia
supernova a few days after maximum light.  A good fit is found to the
template of the subluminous, 1991bg-like type-Ia supernova 1997cn at four days
after maximum.  The velocities of the Si II 635.5- and 597.2-nm absorption
features are measured to be 9300 and 8900 km/s, respectively, using a redshift
of z = 0.027119 for PGC 1483058 (2MASX J03411352+1522440; Smith et al. 2004,
A.J. 128, 1558; via NED).  The R(Si II) line-depth ratio (Nugent et al. 1995,
Ap.J. Let. 455, 147) is about 0.63, which is consistent with 1991bg-like
type-Ia events.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 January 8                   (CBET 3377)              Daniel W. E. Green