[IAUC] CBET 2856: 20111004 : SUPERNOVA 2011gq = PSN J21422844-1606305

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2856
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 2011gq = PSN J21422844-1606305
      S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski,
A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology;
J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad Catolica
de Chile; R. H. McNaught and G. Garradd, Australian National University; E. C.
Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of
Arizona; and E. Christensen, Gemini Observatory, report the discovery of an
apparent supernova in public images from the Mount Lemmon Survey.

 SN       2011 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2011gq   Sep. 26.24   21 42 28.44  -16 06 30.5   19.2    9".4 W, 7".6 N

This variable was designated PSN J21422844-1606305 when it was posted on the
Central Bureau's TOCP webpage and is here designated SN 2011gq based on the
spectroscopic report below.  Joseph Brimacombe, Cairns, Australia, reports
position end figures 28s.38, 30".5 from an unfiltered CCD image taken on Sept.
27.265 UT (image at URL http://www.flickr.com/photos/43846774@N02/6191438300/).
Additional unfiltered CCD magnitudes for 2011gq:  Sept. 28.870, 19.2 (Federica
Luppi and Luca Buzzi, Varese, Italy, 0.38-m f/6.8 reflector; position end
figures 28s.41, 30".0; CMC-14 catalogue reference stars; image posted at URL
http://www.astrogeo.va.it/pub/TOCP/PSN_P902335.jpg); 29.214, 19.8 (Brimacombe;
image posted at http://www.flickr.com/photos/43846774@N02/6196354104/).

     L. Magill and R. Kotak, Queen's University, Belfast, report that an
optical spectrogram (range 350-900 nm) of PSN J21422844-1606305 = SN 2011gq
was obtained at the Nordic Optical Telescope (+ ALFOSC) by M. B. Nielsen on
Sept. 28.85 UT.  After cross-correlated with a library of supernova spectra
using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J.
666, 1024), the best fit was with a normal type-Ia supernova and similar to SN
1998aq at an epoch of 66 days (Branch et al. 2003, A.J. 126, 1489).  Fitting
with SNID yields a redshift of 0.053.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 October 4                   (CBET 2856)              Daniel W. E. Green