Electronic Telegram No. 3789
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 2013hw = PSN J10325543-0155136
     Sergey Shurpakov reports the discovery of an apparent supernova (mag
17.1) on unfiltered 60-s MASTER-Kislovodsk survey exposures (limiting mag
19.2) taken on 2013 Dec. 30.933 UT.  The new object is located at R.A. =
10h32m55s.43, Decl. = -1d55'13".6 (equinox 2000.0), which is 8" east and 5"
south of the nucleus of the galaxy PGC 1106461.  Nothing is visible at this
position on an image obtained on 2013 Nov. 10.108 (limiting mag 19.0).  The
variable was designated PSN J10325543-0155136 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013hw based on the
spectroscopic confirmation reported below.

     F. Bufano and G. Pignata, Universidad Andres Bello, report that an
optical spectrogram (range 380-900 nm), obtained on Jan. 14.3 UT at the SOAR
telescope (+ Goodman Spectrograph) at Cerro Pachon, suggests that PSN
J10325543-0155136 = SN 2013hw is a type-Ia supernova.  Adopting for the host
galaxy a redshift z = 0.05045 (Colless et al. 2001, "2dF Galaxy Redshift
Survey"; via NED), comparison with a library of supernovae spectra via GELATO
(Harutyuyan et al. 2008, A.Ap. 488, 383) shows that 2013hw is a type-Ia event
similar to SN 2003du (Stanishev et al. 2007, A.Ap. 469, 645) at around ten
days after maximum light.  The expansion velocity, deduced from the Si II
635.5-nm minimum, is about 10000 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 January 18                  (CBET 3789)              Daniel W. E. Green