[IAUC] CBET 2747: 20110624 : SUPERNOVA 2011do IN PGC 15078 = PSN J04254756-6748407

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                                                  Electronic Telegram No. 2747
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 2011do IN PGC 15078 = PSN J04254756-6748407
     Colin Drescher, Calamvale, Queensland, Australia, reports the discovery
of an apparent supernova (red mag 14.8) by Stuart Parker (Oxford, Canterbury,
New Zealand) on a 30-s unfiltered CCD image taken on June 11.768 UT with a
35-cm Celestron C14 f/6.3 telescope (+ ST10 CCD camera) as part of the Backyard
Observatory Supernova Search team.  The new object is located at R.A. =
4h25m47s.56, Decl. = -67d48'40".7 (equinox 2000.0; position and magnitude
measured by Drescher, using Astrometrica with the USNO-B1.0 catalogue), which
is 5" west and 13" north of the nucleus of the galaxy PGC 15078 = ESO 55-23
(and located adjacent to a bright foreground star).  The variable was given
the designation PSN J04254756-6748407 when posted at the Central Bureau's TOCP
webpage and is here designated SN 2011do based on the spectroscopic report
below.  A confirming image by Parker showing 2011do was taken on June 12.761
(no additional information provided).  Nothing is visible at the position of
2011do on an image taken on 2011 May 29.684 by Parker (limiting red magnitude
18.6) or on a Digitized Sky Survey image from 1992 Dec. 26 (limiting red
magnitude 19.7).  Joseph Brimacombe, Cairns, Australia, writes that his
unfiltered CCD image taken on June 15.775 yields mag 16.3 and position end
figures 47s.75, 39".5; his image is posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/5838341968/.

     S. Valenti and S. Benetti, Istituto Nazionale di Astrofisica, Osservatorio
Astronomico di Padova, on behalf of a larger collaboration, report that a
spectrogram (range 330-750 nm; resolution 1.5 nm) of PSN J04254756-6748407 =
SN 2011do, obtained on June 24.42 UT with the European Southern Observatory's
New Technology Telescope (+ EFOSC), is that of a type-Ia supernova.  After
cross-correlation with a library of supernova spectra via the "GELATO" code
(Harutyunyan et al. 2008, A.Ap. 488, 383; available at website URL
https://gelato.tng.iac.es/login.cgi), the spectrum of 2011do appears to be
very similar to that of SN 1995al (Asiago Supernova Archive) at 14 days after
maximum light.


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

                         (C) Copyright 2011 CBAT
2011 June 24                     (CBET 2747)              Daniel W. E. Green