[IAUC] CBET 4054: 20150124 : SUPERNOVA 2014ea IN UGC 5912 = PSN J10483231+2635179

Vie Ene 23 22:03:18 ART 2015

                                                  Electronic Telegram No. 4054
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 2014ea IN UGC 5912 = PSN J10483231+2635179
     A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams,
California Institute of Technology; M. Catelan, Pontificia Universidad
Catolica de Chile; and S. M. Larson and E. Christensen, Lunar and Planetary
Laboratory, University of Arizona, report the Catalina Real-time Transient
Survey discovery of an apparent supernova in unfiltered Catalina Sky Survey
(CSS) images:

 SN       2014 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2014ea   Dec. 15.50   10 48 32.31 +26 35 17.9    17.4    67" E, 16" N

The variable was designated PSN J10483231+2635179 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2014ea based on the
spectroscopic confirmation reported below.  Further CCD magnitudes for 2014ea:
2014 Dec. 1.30 UT, [20.0 (CSS); 24.40, 15.7 (CSS); 2015 Jan. 15.969, V = 16.8
(N. James, Chelmsford, Essex, England; Celestron 11 telescope; position end
figures 32s.27, 18".1); 21.048, 16.0 (G. Masi and P. Catalano; remotely using
a 43-cm telescope at Ceccano, Italy); 21.213, 16.0 (S. Howerton; remotely
with iTelescope 0.32-m f/8 astrograph at Nerpio, Spain; image posted at
website URL https://www.flickr.com/photos/watchingthesky/16071460781);
22.49, 16.8 (CSS).  SNe 1971U (IAUC 2378) and 1977F (IAUC 3037) also appeared
in UGC 5912.

     G. Terreran, E. Cappellaro, S. Benetti, N. Elias-Rosa, P. Ochner, A.
Pastorello, L. Tartaglia, L. Tomasella, and M. Turatto, Osservatorio
Astronomico di Padova, Istituto Nazionale di Astrofisica, report that an
optical spectrogram (range 340-800 nm; resolution 1.2 nm) of PSN
J10483231+2635179 = SN 2014ea, obtained on 2014 Dec. 18.18 UT with the Asiago
182-cm Copernico Telescope (+ AFOSC with a new Andor IKON L936 CCD camera
having a higher quantum efficiency both in the ultraviolet and in the
near-infrared) under the Asiago Transient Classification Program (Tomasella
et al. 2014, AN 335, 841), shows that this is a type-Ia supernova.  Adopting
for the host galaxy (UCG 5912) a heliocentric radial velocity of 6295 km/s
(RC3; via NED), a good match is found with several type-Ia supernovae a few
days before B-band maximum light.  An expansion velocity of about 14400 km/s
is derived from the minimum of the Si II 635-nm line.  Classification was
done with GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin
and Tonry 2007, Ap.J. 666, 1024).  The Asiago classification spectra are
posted at URL http://sngroup.oapd.inaf.it.


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

                         (C) Copyright 2015 CBAT
2015 January 24                  (CBET 4054)              Daniel W. E. Green