[IAUC] CBET 3311: 20121125 : SUPERNOVAE 2012gs, 2012gt, 2012gu, 2012gv

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                                                  Electronic Telegram No. 3311
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


SUPERNOVAE 2012gs, 2012gt, 2012gu, 2012gv
     E. Cappellaro, S. Benetti, A. Pastorello, L. Tomasella, and M. Turatto,
Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica (INAF);
G. Pignata and F. Bufano, Universidad Andres Bello; M. T. Botticella, A.
Grado, and L. Limatola, Osservatorio Astronomico di Capodimonte, INAF; M.
Vaccari, University of the Western Cape, South Africa; and M. Capaccioli, G.
Covone, and M. Paolillo, Universita Federico II, Napoli, on behalf of the
SUDARE/VOICE collaboration, report the discovery of four supernovae on r-band
images taken during their supernova search program with the European Southern
Observatory (ESO) VLT Survey Telescope (+ Omegacam).  The new objects were
discovered in the VOICE-CDFS-2 field, an extended area centered on the
Chandra Deep Field South.

 SN        2012 UT          R.A. (2000.0) Decl.      Mag.    Offset
 2012gs    Oct. 25.11    3 33 38.184  -27 20 20.76   22.5    0".4 E
 2012gt    Oct. 25.11    3 33 08.760  -28 05 04.20   23.3   (faint host)
 2012gu    Oct. 25.11    3 52 40.680  -27 26 19.32   23.3    1".3 E, 0".2 N
 2012gv    Nov. 10.30    3 31 37.087  -27 21 18.05   23.3   (faint host)

Spectral classifications were made via GELATO (Harutyunyan et al. 2008, A.Ap.
488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).
     A spectrogram of 2012gs, obtained on Nov. 21.03 UT with the ESO Very
Large Telescope Antu (+ FORS2; range 600-1000 nm, resolution 10 nm), shows the
typical features of a supernova of type Ia.  Adopting a redshift z = 0.525, as
measured from a number of narrow lines of the host galaxy, a good fit was
found with several type-Ia supernovae about 10 days past maximum.
     A spectrogram of 2012gt, obtained on Nov. 21.16 as above, shows that the
object is a supernova of type Ia.   Adopting a redshift z = 0.491, as measured
from a number of narrow lines of the host galaxy, a good fit was found with
several type-Ia supernovae about 10 days past maximum.
     A spectrogram of 2012gu, obtained on Nov. 21.28 as above, shows that the
object is a type-Ic supernova.  Adopting a redshift z = 0.450, as measured
from a number of narrow lines of the host galaxy, a good fit was found with
several type-Ic supernovae shortly after maximum.
     A spectrogram of 2012gv was obtained on Nov. 21.19 as above, showing
that the object is a type-Ia supernova.  A good fit was found with several
type-Ia supernovae about one week past maximum at a redshift z = 0.57.


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                         (C) Copyright 2012 CBAT
2012 November 25                 (CBET 3311)              Daniel W. E. Green