Electronic Telegram No. 2914
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011id = PSN J02574049-5102281
     R. H. McNaught and G. Garradd, Australian National University; A. J.
Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams, California
Institute of Technology; J. L. Prieto, Princeton University; M. Catelan,
Pontificia Universidad Catolica de Chile; E. C. Beshore and and S. M. Larson,
Lunar and Planetary Laboratory, University of Arizona; and E. Christensen,
Gemini Observatory, report the discovery of an apparent supernova in
unfiltered Siding Spring Survey (SSS) images:

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011id   Nov. 1.59    2 57 40.49  -51 02 28.1   18.2    6".9 E, 4".9 S

The variable was designated PSN J02574049-5102281 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2011id based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2011id:  Aug. 28.77 UT, [19.2 (SSS); Nov. 2.635, 18.0 (J. Brimacombe, Cairns,
Australia; infrared filter, bandpass > 700 nm; position end figures 40s.51,
27".8; image posted at http://www.flickr.com/photos/43846774@N02/6306763959/).

     N. Sanders, D. Milisavljevic, and A. Soderberg, Harvard University, report
that low-dispersion spectra (range 400-930 nm), obtained on Nov. 18.3 UT with
the Magellan-Baade telescope (+ IMACS), show PSN J02574049-5102281 = SN 2011id
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) shows matches with normal type-Ia events between +20
and +40 days.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 November 23                 (CBET 2914)              Daniel W. E. Green