[IAUC] CBET 3733: 20131204 : SUPERNOVA 2013gr IN ESO 114-G7 = PSN J01462790-5840238

Mar Dic 3 21:17:07 ART 2013

                                                  Electronic Telegram No. 3733
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 2013gr IN ESO 114-G7 = PSN J01462790-5840238
     Greg Bock, Windaroo, Queensland, Australia, reports the discovery by
Peter Marples (Loganholme, Queensland) of an apparent supernova (red mag 17.3)
on a 30-s unfiltered CCD image (limiting mag 17.8) taken by Marples on Nov.
28.48 UT with a 30-cm Meade LX200R f/6.2 reflector (+ SXV-H9 Starlight Xpress
camera) in the course of the Backyard Observatory Supernova Search.  The new
object is located at R.A. = 1h46m27s.90, Decl. = -58d40'23".8 (equinox 2000.0;
reference stars from USNO-B and UCAC4 catalogues), which is 8".9 west and 2".2
north of the nucleus of the galaxy ESO 114-G7.  Nothing is visible at this
position on Digitized Sky Survey red and infrared images (limiting red mag >
19).  The variable was designated PSN J01462790-5840238 when it was posted at
the Central Bureau's TOCP webpage and is here designated SN 2013gr based on
the spectroscopic confirmation reported below.

     E. Y. Hsiao, N. Morrell, and M. M. Phillips, Las Campanas Observatory;
G. H. Marion, University of Texas, Austin; T. Diamond, Florida State
University; M. D. Stritzinger and C. Contreras, Aarhus University; and R. P.
Kirshner, Harvard-Smithsonian Center for Astrophysics, report that a near-
infrared spectrogram (range 800-2500 nm) of PSN J01462790-5840238 = SN 2013gr
was obtained on Nov. 30.14 UT with the FoldedPort Infrared Echellette (FIRE)
spectrograph on the 6.5-m Magellan Baade Telescope.  The spectrum indicates
that 2013gr is a 2002cx-like supernova.  The near-infrared spectrum is similar
to that of SN 2010ae near maximum light (Stritzinger et al. 2013, A.Ap., in
press).  The spectrum separately resolves the three components of the Ca II
infrared triplet (854.2, 866.2, 849.8 nm), and the velocity for Ca II is
approximately 5000 km/s, measured at the absorption minima and using a
redshift z = 0.0074 for the presumed host galaxy, ESO 114-G7 (from Koribalski
et al. 2004, A.J. 128, 16; via NED).

     M. Dennefeld, Institut d'Astrophysique de Paris and Universite Pierre et
Marie Curie; D. Bersier and J. Lyman, Liverpool John Moores University; J. R.
Maund, Queen's University, Belfast; A. Pastorello, Istituto Nazionale di
Astrofisica, Padova Astronomical Observatory; A. De Cia, Weizmann Institute
for Science; S. Benetti, Istituto Nazionale di Astrofisica, Padova
Astronomical Observatory; C. Inserra, S. Smartt, K. Smith, and D. Young,
Queen's University, Belfast; M. Sullivan, University of Southampton; S.
Taubenberger, Max-Planck-Institut fuer Astrophysik; S. Valenti, University of
California at Santa Barbara and Las Cumbres Observatory Global Telescope; M.
Fraser, Institute of Astronomy, Cambridge; and O. Yaron and A. Gal-Yam,
Weizmann Institute for Science, on behalf of the "Public European Southern
Observatory Spectroscopic Survey for Transient Objects" collaboration (see
Valenti et al., posted at URL http://www.astronomerstelegram.org/?read=4037),
report that optical spectroscopy of 2013gr, obtained on Dec. 1.06 UT with the
New Technology Telescope (+ EFOSC2; spectral range 360-910 nm), shows that
it is a type-Ia supernova, similar to SN 2002cx, at redshift z = 0.007 and
around five days after maximum.  The classification was made via SNID (Blondin
and Tonry 2007, Ap.J. 666, 1024) and GELATO (Harutyunyan et al. 2008, A.Ap.
488, 383); PESSTO classification spectra can be obtained from website URL
http://www.pessto.org/.


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

                         (C) Copyright 2013 CBAT
2013 December 4                  (CBET 3733)              Daniel W. E. Green