[IAUC] CBET 3296: 20121113 : SUPERNOVA 2012gg

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3296
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 2012gg
     A. A. Mahabal, A. J. Drake, S. G. Djorgovski, M. J. Graham, and R.
Williams, California Institute of Technology; J. L. Prieto, Princeton
University; M. Catelan, Pontificia Universidad Catolica de Chile; and S. M.
Larson and E. Christensen, Lunar and Planetary Laboratory, University of
Arizona, report the discovery of an apparent supernova in unfiltered Catalina
Sky Survey (CSS) images:

 SN        2012 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2012gg    Oct. 27.38   4 36 11.05  - 5 04 53.1    17.7       1" S

Further CSS magnitudes for 2012gg:  Oct. 11.40 UT, 17.7; 17.44, 17.6.
Photometric magnitudes obtained with the Palomar 1.5-m telescope (+ Gunn
filters):  Nov. 2.24, r = 17.6; i = 17.7; z = 17.4.

     L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, M. Turatto, and
M. Fiaschi, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that optical spectroscopy (range 340-820 nm; resolution
1.3 nm) obtained on Nov. 6.07 UT with the Asiago 1.82-m Copernico Telescope (+
AFOSC; range 350-820 nm; resolution 1.3 nm), shows that 2012gg is a type-II
supernova about one month after explosion at redshift, z, about 0.03.  For
the estimated epoch, a high ejecta-expansion velocity of about 9500 km/s is
derived from the minimum of the broad, P-Cyg-profile H-alpha line.  The
Asiago classification spectra are posted at the following website URL:
http://graspa.oapd.inaf.it.  Classification was made via GELATO (Harutyunyan
et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666,
1024).


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                         (C) Copyright 2012 CBAT
2012 November 13                 (CBET 3296)              Daniel W. E. Green