[IAUC] CBET 3629: 20130815 : SUPERNOVA 2013ew = PSN J22100969+1116479

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                                                  Electronic Telegram No. 3629
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 2013ew = PSN J22100969+1116479
     Denis Vida communicates that Miguel Hurtado and the "La Sagra Sky Survey"
(LSSS) Supernova Search Team (which also includes Filip Novoselnik, Ivica
Skokic, David Gostinski, Salvador Sanchez, Jaime Nomen, Reiner Stoss, Bill
Yeung, and Juan Rodriguez) have discovered an apparent supernova (magnitude
18.7) on three unfiltered CCD images (limiting mag about 20.0) taken on Aug.
13.891, 13.901, and 13.911 UT with a 0.45-m telescope.  The new object is
located at R.A. = 22h10m09s.69, Decl = +11d16'47".9 (equinox 2000.0), which
is 25" east and 20".5 north of the nucleus of the presumed host galaxy.
Nothing is visible at this position to mag 22 on a red Digitized Sky Survey
plate from 1990 Sept. 16.258.  The LSSS image from Aug. 13 has been posted
(with the red DSS image on the right) at URL http://i.imgur.com/YSWu72t.png,
with other images posted at website URL http://i.imgur.com/zDwae6r.png.  The
variable was designated PSN J22100969+1116479 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013ew based on the
spectroscopic confirmation reported below.

     L. Tomasella, A. Pastorello, S. Benetti, E. Cappellaro, P. Ochner, and M.
Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica,
report that a noisy optical spectrum (range 340-820 nm; resolution 1.3 nm),
obtained on Aug. 14.94 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC),
shows that PSN J22100969+1116479 = SN 2013ew is a peculiar type-Ia supernova.
The best fit is obtained with energetic 1991T-like supernovae several days
before maximum light, at a redshift z of about 0.056.  The Asiago
classification spectra are posted at website URL http://sngroup.oapd.inaf.it;
classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383)
and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 August 15                   (CBET 3629)              Daniel W. E. Green