Electronic Telegram No. 3204
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 2012ed
     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.      Offset
 2012ed   Aug. 13.18   15 39 36.45  - 2 41 00.7   17.6    1".3 W, 1".0 S

Nothing was visible at this position on a CSS image from June 17.34 UT
(limiting mag 20.5).

     L. Tomasella, A. Pastorello, S. Benetti, M. Fiaschi, P. Ochner, E.
Cappellaro, M. Turatto, and S. Valenti, Osservatorio Astronomico di Padova,
Istituto Nazionale di Astrofisica, report that a spectrogram of 2012ed,
obtained on Aug. 17.81 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC;
range 340-820 nm; resolution 2.1 nm), suggests that this is a type-II
supernova.  Together with prominent Balmer lines with P-Cyg profiles, Fe II
features are clearly detected.  Measuring a redshift of z = 0.015 from the
peak of the broad H-alpha emission (FWHM about 8300 km/s), a comparison with
a library of supernovae spectra via GELATO (Harutyuyan et al. 2008, A.Ap.
488, 383) shows that 2012ed is a type-II event similar to SN 2009bw (Inserra
et al. 2012, MNRAS 422, 1122) about 50 days after the explosion.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 August 19                   (CBET 3204)              Daniel W. E. Green