[IAUC] CBET 2915: 20111123 : SUPERNOVA 2011ie = PSN J23005471+1850323

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                                                  Electronic Telegram No. 2915
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 2011ie = PSN J23005471+1850323
     H. Mikuz and B. Dintinjana, Crni Vrh Observatory, report the discovery of
a possible supernova (mag 17.0) by Jan Vales on four unfiltered CCD images
(bandpass roughly equivalent to the R band) taken on Nov. 17.780-17.825 UT
with the 60-cm f/3.3 Cichocki reflector in the course of the Comet and
Asteroid Search Program (PIKA) at Crni Vrh Observatory.  The new object is
located at R.A. = 23h00m54s.71, Decl. = +18o50'32".3 (equinox 2000.0;
uncertainty about 0".2), which is approximately 6" east and 4" south of the
center of a nearby galaxy.  Nothing is visible at this position on several
Digitized Sky Survey red and blue images from the Palomar Sky Survey.  The
discovery image is posted at the following website URL:
http://www.observatorij.org/vstars/PSN20111117/PSN20111117.jpg.  The variable
was designated PSN J23005471+1850323 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2011ie based on the spectroscopic
confirmation reported below.  Additional CCD magnitudes for 2011ie (unfiltered
unless noted otherwise):  2009 Sept. 27, [18.0 (PIKA; R filter); 2011 Oct. 3,
[19.5 (PIKA; unfiltered); Nov. 18.752, R = 17.03 +/- 0.05 (Dintinjana and
Mikuz; photometry somewhat contaminated by nearby galaxy); 20.12, 17.3 (R. A.
Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector + Apogee AP-47p camera;
limiting magnitude 20.3; position end figures 54s.71, 32".4; UCAC3 reference
stars); 21.772, R = 16.7 +/- 0.1 (B. Dintinjana and S. Maticic).

     S. Valenti, A. Pastorello, S. Benetti, L. Tomasella, F. Bufano, and P.
Ochner, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova,
on behalf of a larger collaboration, report that a spectrogram of PSN
J23005471+1850323 = SN 2011ie, obtained on Nov. 20.85 UT with the 1.82-m
Copernico Telescope (+ AFOSC; range 340-790 nm, resolution 2.2 nm), shows it
to be a type-Ia supernova.  Cross-correlation with a library of supernova
spectra using the "Supernova Identification" code (SNID; Blondin and Tonry
2007, Ap.J. 666, 1024) suggests that 2011ie is similar to SN 1994D at a few
days before maximum.  Adopting a redshift of z = 0.031, the velocity of the
ejected material, deduced from the minimum of the Si II 635-nm line, is about
11300 km/s.


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                         (C) Copyright 2011 CBAT
2011 November 23                 (CBET 2915)              Daniel W. E. Green