[IAUC] CBET 3970: 20140912 : SUPERNOVA 2014dc IN IC 1949

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                                                  Electronic Telegram No. 3970
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 2014dc IN IC 1949
     J. Maza, L. E. Gonzalez, E. Maureira, E. Cosgrove, and R. Antezana,
Universidad de Chile, on behalf of the Center of Astrophysics and Associated
Technologies (CATA) Supernova Search, report the discovery of an apparent
supernova (magnitude approximately 17.0) on one unfiltered 60-s exposure taken
on Sept. 4.343 UT with the 0.50-m "CATA500" telescope located at Cerro Tololo.
The new object is located at R.A. = 03h30m55s.11 +/- 0".2, Decl. =
-47d58'51".1 +/- 0".2 (equinox 2000.0), which is about 23" east and 6" south
of the nucleus of the galaxy IC 1949.  Nothing is detected at the position of
the variable on Aug. 25.336 (limiting magnitude 19) or in many images from
2012 and 2013.  The discovery was made using a semi-automatic software
developed by E. Maureira and P. Cortes at CATA.

     Y. Beletsky, N. Morrell, and M. M. Phillips, Las Campanas Observatory;
and E. Y. Hsiao, Aarhus University, on behalf of the Carnegie Supernova
Project, report that an optical spectrogram (range 390-1000 nm) of 2014dc was
obtained on Sept. 10.23 UT with LDSS3 on the 6.5-m Magellan II (Clay)
telescope at Las Campanas Observatory.  Inspection of the spectrum shows that
2014dc is a young type-II supernova.  Cross-correlation with a library of
supernova spectra using the Supernova Identification tool (SNID; Blondin and
Tonry 2007, Ap.J. 666, 1024) yields good matches with many type-II-P
supernovae near maximum light; the best match is to SN 2004et at 2-3 days
before maximum brightness.  The redshift suggested by SNID is z = 0.02, in
agreement with that of the apparent host, IC 1949, at z = 0.022436 +/-
0.000264 (de Vaucouleurs et al. 1999, RC3.9; via NED).

     M. Childress, R. Scalzo, F. Yuan, B. Zhang, A. Ruiter, I. Seitenzahl, and
B. Schmidt, Australian National University (ANU); and B. Tucker, ANU and
University of California at Berkeley, report that spectroscopic classification
of 2014dc was obtained on Sept. 10.67 UT via a 60-min exposure with the Wide
Field Spectrograph (cf. Dopita et al. 2007, Ap. Space Sci. 310, 255) on the
ANU 2.3-m telescope at Siding Spring using the B3000/R3000 gratings
(wavelength range 350-980 nm at 0.1-nm resolution).  The spectrum indicates
that 2014dc is a type-II supernova near maximum light, with P-Cyg profiles of
Balmer lines (H-alpha, H-beta) and a blue continuum.  Classification with SNID
(Blondin and Tonry 2007, Ap.J. 666, 1024) shows a good match to SN 1999em at
maximum light, and the preferred SNID redshift is about 0.02, consistent with
the apparent host galaxy, IC 1949 (z = 0.022436; RC3 catalogue).


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                         (C) Copyright 2014 CBAT
2014 September 12                (CBET 3970)              Daniel W. E. Green