SIMBAD references

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.