[IAUC] CBET 3223: 20120914 : SUPERNOVA 2012eq IN ESO 412-1 = PSN J01001437-3048309

Jue Sep 13 19:03:01 ART 2012

                                                  Electronic Telegram No. 3223
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)
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Prepared using the Tamkin Foundation Computer Network

SUPERNOVA 2012eq IN ESO 412-1 = PSN J01001437-3048309
     R. H. McNaught, 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; and E. Christensen and S. M. Larson, Lunar and
Planetary Laboratory, University of Arizona, report the discovery of an
apparent supernova in unfiltered Siding Spring Survey (SSS) images:

 SN       2012 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2012eq   Aug. 27.58   1 00 14.37  -30 48 30.9   15.4    9".8 E, 6".3 N

The variable was designated PSN J01001437-3048309 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2012eq based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2012eq (presumed unfiltered unless noted otherwise):  2011 Nov. 1.55 UT, [19.0
(SSS); 2012 Aug. 30.787, 17.2 (Joseph Brimacombe, Cairns, Australia; infrared
filter, bandpass > 700 nm; position end figures 14s.33, 31".0; image posted
at website URL http://www.flickr.com/photos/43846774@N02/7897613544/); Sept.
4.66, 15.6 (SSS); Sept. 7.571, R = 17.1 (P. Miller, P. Roche, A. Tripp, R.
Miles, R. Holmes, S. Foglia, and L. Buzzi; 2.0-m f/10 "Faulkes Telescope
North" + Bessell R filter at Haleakala in bad seeing conditions; position end
figures 14s.38, 31".4).

     N. Morrell, Las Campanas Observatory, on behalf of the Carnegie Supernova
Project, reports that an optical spectrogram (range 380-920 nm) of PSN
J01001437-3048309 = SN 2012eq was obtained on Sept. 8.38 UT with the du Pont
telescope (+ WFCCD).  Inspection of the data showed that 2012eq is a type-Ia
supernova at several days past maximum brightness.  Cross-correlation with a
library of supernova spectra using the Supernova Identification tool (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) provides excellent matches with a
number of type-Ia events between 5 and 12 days after maximum light, the
best comparison being 1992A at 8 days past maximum.  SNID also suggests for
2012eq a redshift of 0.0323, in coincidence with the recession velocity of
9661 km/s given in NED for ESO 412-1 (Jones et al. 2009, "The 6dF Galaxy
Survey Data Release 3").

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

                         (C) Copyright 2012 CBAT
2012 September 14                (CBET 3223)              Daniel W. E. Green