[IAUC] CBET 3274: 20121026 : SUPERNOVAE 2012fn, 2012fo, 2012fp, 2012fq

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3274
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 2012fn, 2012fo, 2012fp, 2012fq
     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 (cf. CBET 3236), 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).

SN        2012 UT          R.A. (2000.0) Decl.       Mag.    Offset
2012fn    Oct. 7.33     3 35 28.283  -27 36 21.63    21.6      --
2012fo    Oct. 7.33     3 31 38.461  -27 13 51.92    22.0      --
2012fp    Oct. 7.33     3 32 43.203  -27 10 33.27    23.2   0".8 E, 0".8 S
2012fq    Oct. 7.33     3 32 32.900  -27 51 21.13    22.6    faint host

     A spectrogram of 2012fn, obtained on Oct. 22.10 UT with the ESO Very Large
Telescope Antu (+ FORS2; range 370-920 nm, resolution 10 nm), shows the
typical features of a type-Ic supernova.  Adopting a redshift z = 0.284, as
measured from a number of narrow lines of the host galaxy, the best fit with
the GELATO tool (Harutyuyan et al. 2008, A.Ap. 488, 383) with a library of
supernova spectra is with SN 2004aw (Taubenberger et al. 2006, MNRAS 371,
1459) a few days after maximum.
     A spectrogram of 2012fo, obtained on Oct. 22.23 as above, shows that the
object is a type-II supernova.   Adopting a redshift z = 0.238, as measured
from a number of narrow lines of the host galaxy, the best fit with the
GELATO tool is with SN 1993J (Barbon et al. 1995, A.Ap. Suppl. 110, 513)
near maximum.
     A spectrogram of 2012fp was obtained on Oct. 22.34, as above.  The
spectrum shows a very blue, featureless continuum reminiscent of early
type-IIn supernovae.  Adopting a redshift z = 0.644, as measured from a
number of narrow lines of the host galaxy, the continuum temperature is
about 16000 K.
     A spectrogram of 2012fq, obtained on Oct. 22.18, as above (but range
600-1000 nm, resolution 10 nm), shows that the object is a type-Ia
supernova.  Adopting a redshift z = 0.67, as measured from a number of
narrow lines of the host galaxy, the best fit with the GELATO tool is
with type-Ia supernovae near maximum.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 October 26                  (CBET 3274)              Daniel W. E. Green