[IAUC] CBET 3324: 20121203 : SUPERNOVA 2012hd IN IC 1657 = PSN J01140746-3239077

Lun Dic 3 08:59:50 ART 2012

                                                  Electronic Telegram No. 3324
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 2012hd IN IC 1657 = PSN J01140746-3239077
     Stuart Parker, Oxford, Canterbury, New Zealand, reports his discovery of
an apparent supernova (red mag 16.4) on an 35-s unfiltered CCD image (limiting
magnitude 19.5) taken on Nov. 20.53 UT using a 30-cm Astro-Tech AT12RC
Ritchey-Chretien astrograph (+ ST10 camera) in the course of the Backyard
Observatory Supernova Search.  The new object was measured by Greg Bock
(Windaroo, Queensland, Australia) as being located at R.A. = 1h14m07s.46,
Decl. = -32d39'07".7 (equinox 2000.0; reference stars from USNO-B and UCAC3
catalogues), which is 5" east and 3" south of the galactic nucleus of IC 1657.
Nothing is visible at this position on Digitized Sky Survey red and infrared
images (limiting red magnitude > 19).  The discovery image can be viewed via
website URL http://tinyurl.com/d25w522.  The variable was designated PSN
J01140746-3239077 when it was posted at the Central Bureau's TOCP webpage
and is here designated SN 2012hd based on the spectroscopic confirmation
reported below.  Additional CCD magnitudes for 2012hd:  Nov. 8.53, [19.0
(Parker); 23.220, R = 15.4 (Joseph Brimacombe, Cairns, Australia; remotely
using a 51-cm RCOS telescope at the New Mexico Skies Observatory near
Mayhill, NM, U.S.A.; position end figures 07s.37, 08".1; image posted at
website URL http://www.flickr.com/photos/43846774@N02/8211370339/); 24.525,
16.4 (Brimacombe; 41-cm RCOS telescope; infrared filter, bandpass > 700 nm;
position end figures 07s.40, 07".0; image posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/8216825072/).

     G. Pignata and F. Bufano, Universidad Andres Bello; S. Gonzalez-Gaitan,
S. Marchi, F. Forster, J. Anderson, and C. Gutierrez, Universidad de Chile; S.
Taubenberger, Max-Planck-Institute fuer Astrophysik, Garching; S. Valenti,
University of California at Santa Barbara and Las Cumbres Observatory Global
Telescope; A. Pastorello and S. Benetti, Istituto Nazionale di Astrofisica,
Padova Astronomical Observatory; S. J. Smartt, K. Smith, D. Young, and C.
Inserra, Queen's University, Belfast; M. Sullivan, University of Southampton;
and A. Gal-Yam and O. Yaron, Weizmann Institute for Science, on behalf of the
PESSTO collaboration (cf. Valenti et al., as posted at website URL
http://www.astronomerstelegram.org/?read=4037), report on optical spectroscopy
(range 360-910 nm), obtained on Nov. 23.24 UT with the New Technology
Telescope (+ EFOSC2), showing PSN J01140746-3239077 = SN 2012hd to be a
type-Ia supernova a few days before maximum.  PESSTO classification spectra
can be obtained at 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).


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

                         (C) Copyright 2012 CBAT
2012 December 3                  (CBET 3324)              Daniel W. E. Green