[IAUC] CBET 3285: 20121101 : SUPERNOVA 2012fz IN ESO 185-54 = PSN J20032484-5557192

Jue Nov 1 10:40:26 ART 2012

                                                  Electronic Telegram No. 3285
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)
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Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2012fz IN ESO 185-54 = PSN J20032484-5557192
     J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S.
Silva, F. Carrasco, P. Sanchez, C. Hervias, and R. Ramirez, Universidad de
Chile; G. Pignata, M. Cifuentes, Y. Apostolovski, and M. Vidal, Universidad
Andres Bello; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel,
Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. Reichart,
K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze,
University of North Carolina at Chapel Hill, on behalf of the CHASE project
(which is part of the Millennium Center for Supernova Science collaboration),
report the discovery of an apparent supernova ESO 185-54 (mag approximately
14.5) on a unfiltered image taken on June 27.38 UT with the 0.41-m 'PROMPT 1'
telescope located at Cerro Tololo.  The new object is located at R.A. =
20h03m24s.84 +/- 0".2, Decl. = -55o57'19".2 +/- 0".2 (equinox 2000.0), which
is about 18".2 west and 29".3 south of center of the galaxy ESO 185-54.
Nothing is visible at this position in a stack of nine 40-s archival images
taken between Mar. 26.38 and May 24.39 (limiting mag 20.0).  The variable was
designated PSN J20032484-5557192 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2012fz based on the spectroscopic
confirmation reported below.  Additional CCD magnitudes for 2012fz:  June
5.25, [18.0 (CHASE); July 1.622, 15.9 (Joseph Brimacombe, Cairns, Australia;
infrared filter; wavelength > 700 nm; position end figures 24s.84, 19".1;
image posted at URL http://www.flickr.com/photos/43846774@N02/7485846136/);
7.47, 14.5 (A. Klotz; TAROT telescope at La Silla, Chile).

     C. Inserra, S. J. Smartt, M. Fraser, D. Young, and K. Smith, Queen's
University, Belfast; F. Cellier-Holzem and P. El-Hage, Laboratoire de Physique
Nucleaire et de Hautes Energies, Paris; Y.-C. Pan, University of Oxford; M.
Sullivan, University of Southampton; I. Arcavi, A. Gal-Yam, and O. Yaron,
Wiezmann Institute of Science; S. Benetti, A. Pastorello, and S. Valenti,
Istituto Nazionale di Astrofisica, Padova; and S. Taubenberger, A. Sternberg,
and S. Benitez-Herrera, Max-Planck-Institute fuer Astrophysik, Garching, on
behalf of the PESSTO collaboration (see Valenti et al., posted at website URL
http://www.astronomerstelegram.org/?read=4037), report that optical
spectroscopy (range 360-910 nm), obtained on Aug. 7 with the New Technology
Telescope (+ EFOSC2), show that PSN J20032484-5557192 = SN 2012fz is a
type-Ia supernova at redshift z = 0.017; the best fit is to the spectrum of
SN 2003du at 33 days past explosion.  PESSTO classification spectra can be
obtained from website URL http://www.pessto.org/; classification is made via
SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) and GELATO (Harutyunyan et al.
2008, A.Ap. 488, 383).


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                         (C) Copyright 2012 CBAT
2012 November 1                  (CBET 3285)              Daniel W. E. Green