[IAUC] CBET 2749: 20110626 : SUPERNOVA 2011dq IN NGC 337 = PSN J00594775-0734205

Mie Sep 14 16:18:48 ART 2011

                                                  Electronic Telegram No. 2749
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 2011dq IN NGC 337 = PSN J00594775-0734205
     L. A. G. Monard, Pretoria, South Africa, reports his discovery of an
apparent supernova (mag 16.3) on unfiltered CCD images taken on May 15.174 UT
at the Klein Karoo Observatory.  The new object is located at R.A. =
0h59m47s.75, Decl. = -7d34'20".5 (equinox 2000.0), which is 35" west and 22"
north of the core of the SBd-type galaxy NGC 337; the position coincides with
a dense region in a spiral arm of this nearby galaxy.  Nothing is seen at
this position in Digitized Sky Survey images (limiting red mag 20.5) or on
earlier images taken from Monard's Bronberg Observatory in 2010 (limiting mag
18.5 and deeper).  The variable was designated PSN J00594775-0734205 when
posted at the Central Bureau's TOCP webpage and is here designated SN 2011dq
based on the spectroscopic confirmation given below.  Additional magnitudes
for 2011dq:  2011 Jan. 30.781, [17.0 (Monard); May 16.178, 16.4 (Monard);
18.177, 16.4 (Monard); 20.814, 15.4 (Joseph Brimacombe, Coral Towers
Observatory, Cairns, Australia; 30-cm telescope + STL6K camera + red filter);
22.818, 15.6 (Brimacombe; position end figures 47s.74, 16".2).  Brimacombe's
second image (the one from May 22) is posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/5751069620/.

     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 J00594775-0734205 =
SN 2011dq, obtained on June 25.43 UT with the European Southern Observatory's
New Technology Telescope (+ EFOSC), is that of a type-II 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 2011dq appears to be
similar that of SN 2005cs (Pastorello et al. 2009, MNRAS 394, 2266) about one
month past maximum.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 June 26                     (CBET 2749)              Daniel W. E. Green