Electronic Telegram No. 3943
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2014cc IN NGC 2255 = PSN J06335776-3448276
[Editor's note:  this text replaces that on CBET 3940 (first spectroscopic
item only).]
     S. Parker, Canterbury, New Zealand, reports the discovery of an apparent
supernova (red mag 15.9) on a 30-s unfiltered CCD image (limiting mag 18.5)
taken by himself on Aug. 9.764 UT with an Officina Stellare 40-cm f/5.25 RiLA
Astrograph (+ ST10 camera) at his Parkdale Observatory in the course of the
Backyard Observatory Supernova Search.  The new object is located at R.A. =
6h33m57s.76, Decl. = -34d48'27".6 (equinox 2000.0; reference stars from USNO-B
and UCAC4 catalogues), which is 10" west and 17" north of the nucleus of the
galaxy NGC 2255.  Nothing is visible at this position on Digitized Sky Survey
red and infrared images (limiting red mag > 19).  An image of the variable can
be seen via website URL http://tinyurl.com/phb5zvv.  The variable was
designated PSN J06335776-3448276 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2014cc based on the spectroscopic
confirmation reported below.  Additional CCD magnitudes for 2014cc by J.
Brimacombe, Cairns, Australia (remotely with a 41-cm RCOS telescope + U9000
camera + luminance filter at the Warrumbungle Observatory, Siding Spring):
Aug. 10.823, 16.0 (position end figures 57s.77, 27".8; image posted at website
URL https://www.flickr.com/photos/43846774@N02/14890919372/); 11.819, 16.0
image posted at https://www.flickr.com/photos/43846774@N02/14890919372/).

     N. Elias-Rosa, L. Tartaglia, and L. Tomasella, Osservatorio Astronomico
di Padova, INAF; A. Morales-Garoffolo, Institut de Ciencies de l'Espai, IEEC,
Consejo Superior de Investigaciones Cientificas, Barcelona; A. Pastorello,
Osservatorio Astronomico di Padova, INAF; M. T. Botticella, Osservatorio
Astronomico di Capodimonte, INAF; C. Inserra, Queen's University, Belfast; K.
Maguire, European Southern Observatory; S. Smartt and K. W. Smith, Queen's
University, Belfast; M. Sullivan, Southampton University; S. Valenti, Las
Cumbres Observatory Global Telescope; O. Yaron, Weizmann Institute for
Science; D. Young, Queen's University, Belfast; I. Manulis, Weizmann Institute
for Science; C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz,
S. Rostami, and E. S. Walker, Yale University; U. Feindt and M. Kowalski,
Universitaet Bonn; P. Nugent, Lawrence Berkeley Laboratory; and L.
Wyrzykowski, Warsaw Observatory, report that an optical spectrogram of PSN
J06335776-3448276 = SN 2014cc, obtained on Aug. 15 UT with the European
Southern Observatory's New Technology Telescope at La Silla using EFOSC2 and
Grism 13 (range 398.5-931.5 nm; 1.8-nm resolution) under the Public ESO
Spectroscopic Survey for Transient Objects (see URL http://www.pessto.org),
shows that this is a normal type-Ia supernova at B-band maximum light.  A good
match is found with several type-Ia supernovae at redshift about 0.02 and near
maximum light.  Classification spectra can be obtained from the PESSTO website
(via WISeREP).

     N. Morrell and M. Phillips, Las Campanas Observatory; and E. Y. Hsiao,
Aarhus University, on behalf of the Carnegie Supernova Project, report that on
Aug. 14.34 UT they obtained an optical spectrogram (range 360-930 nm) of PSN
J06335776-3448276 = SN 2014cc with the Magellan I (Baade) telescope at Las
Campanas (+ IMACS), which shows this to be a type-Ia supernova near maximum
brightness.  Cross-correlation with a library of supernova spectra using the
Supernova Identification tool (Blondin and Tonry 2007, Ap.J. 666, 1024)
provides an excellent match to the spectrum of SN 2007af at three days before
maxium light, along with many good comparisons with other normal type-Ia
supernovae around maximum.  Adopting for NGC 2255 a recession velocity of
6873 km/s (Thereau et al. 1998, A.Ap. Suppl. 130, 333; via NED), the minimum
of the Si II 635.5-nm absorption in the spectrum of 2014cc appears
blueshifted by approximately 10000 km/s.


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

                         (C) Copyright 2014 CBAT
2014 August 28                   (CBET 3943)              Daniel W. E. Green