Electronic Telegram No. 3165
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 2012di
     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 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.
 2012di   June 14.33   14 08 06.69  +58 03 07.7   18.1

Nothing was visible at this position on a CSS image from May 29.30 UT
(limiting mag 19.2).

     L. Tomasella, A. Pastorello, S. Valenti, S. Benetti, E. Cappellaro, M.
Turatto, and P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale
di Astrofisica, report that a spectrogram of 2012di, obtained on June 30.01 UT
with the Asiago 1.82-m Copernico Telescope (+ AFOSC; range 340-820 nm;
resolution 2.4 nm), suggests that it is a normal type-Ia supernova.  Cross-
correlation with a library of supernova spectra via the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows
that 2012di is similar to several normal type-Ia supernovae at ten days after
maximum at a redshift about 0.070.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 July 6                      (CBET 3165)              Daniel W. E. Green