[IAUC] CBET 3085: 20120419 : SUPERNOVA 2012br

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 3085
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 2012br
     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; 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 unfiltered
Catalina Sky Survey (CSS) images:

 SN        2012 UT        R.A. (2000.0) Decl.      Mag.
 2012br    Mar. 28.31   12 24 17.02  +18 55 29.3   17.8

Further CSS magnitudes for 2012br:  Mar. 2.33 UT, [19.8; Mar. 22.29, 18.0.

     L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, P. Ochner, M.
Turatto, and S. Valenti, Osservatorio Astronomico di Padova, Istituto
Nazionale di Astrofisica, report that a spectrum (range 360-810 nm; resolution
2.3 nm) of 2012br was obtained on Apr. 1.06 UT with the Ekar-Copernico 1.82-m
telescope (+ AFOSC).  The spectrum shows that 2012br is a type-II supernova
with strong Balmer lines -- in particular, a broad H_alpha emission with FWHM
corresponding to about 11000 km/s.  Cross-correlation with a library of
supernova spectra via the "Supernova Identification" code (SNID; Blondin and
Tonry 2007, Ap.J. 666, 1024) returns a best fit with the type-IIP supernova
2004et soon after explosion and a redshift z = 0.019.


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                         (C) Copyright 2012 CBAT
2012 April 19                    (CBET 3085)              Daniel W. E. Green