[IAUC] CBET 3386: 20130119 : SUPERNOVA 2013I

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3386
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 2013I
     Masaomi Tanaka, National Astronomical Observatory of Japan; Kensho Mori,
Konan University; Tomoki Morokuma, Institute of Astronomy, University of
Tokyo; Nozomu Tominaga, Konan University; Katsutoshi Takaki, Ryosuke Itoh,
Yuuki Moritani, Nana Ebisuda, Yuuma Ohashi, and Hiroshi Akitaya, Hiroshima
University; Yoshihiko Saito and Ryuichi Usui, Tokyo Institute of Technology;
and Mark Phillips, Nidia Morrell, Carlos Contreras, Consuelo Gonzalez, and
Eric Hsiao, Las Campanas Observatory, on behalf of the Kiso Supernova Survey
(KISS) collaboration, report the discovery of an apparent supernova (mag 18.6)
on a g-band CCD image (limiting mag 21.0) taken on Jan. 11.41 UT with the
Kiso Wide Field Camera (field-of-view 2.1 deg x 2.1 deg) on the 1.05-m Kiso
Schmidt telescope at the Kiso Observatory.  The new object is located at
R.A. = 2h49m42s.17, Decl. = +0d45'35".7 (equinox 2000.0), which is 8".8 west
and 0".3 south of the presumed host galaxy (SDSS J024942.76+004535.4; at z =
0.035, from the Sloan Digital Sky Survey database).  This object was also
marginally detected with a g-band magnitude of 20 in their previous image
taken on 2012 Nov. 6.58, but nothing is seen at this position in an image
taken on 2012 Oct. 21.78 or on the Sloan Digital Sky Survey image.  SN 2013I
was also detected with the 1.5-m Kanata telescope (+ HOWPol) at the
Higashi-Hiroshima Observatory at R = 17.8 on 2013 Jan. 12.38.  The discoverers
note that 2013I appears to have been independently discovered by the Dark
Energy Supernova Survey (cf. http://www.astronomerstelegram.org/?read=4741).

     M. Stritzinger, Department of Physics and Astronomy, Aarhus University;
F. Taddia, Oskar Klein Centre, Stockholm University; and E. Hsiao, Las
Campanas Observatory, on behalf of the KISS collaboration, report that they
obtained a visual-wavelength spectrogram on Jan. 15.9 UT of SN 2013I with
the Nordic Optical Telescope (+ Alfosc).  Exhibiting multi-component H_alpha
and H_beta emission features, superposed on a continuum containing a number
of broad absorption features, the spectrum is reminiscent of the interacting
type-Ia supernova 2002ic.  Making use of the "Supernova Identification" code
(SNID; Blondin and Tonry 2007, Ap.J. 666, 1024), they find that SN 2013I
closely resembles a near-maximum spectrum of SN 2005gj (Aldering et al. 2006;
Prieto et al. 2007).  However, in the case of SN 2013I, the narrow Balmer
emission component is significantly more conspicuous.


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                         (C) Copyright 2013 CBAT
2013 January 19                  (CBET 3386)              Daniel W. E. Green