[IAUC] CBET 2739: 20110610 : SUPERNOVA 2011dc

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2739
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 2011dc
     L. Tomasella, P. Ochner, S. Valenti, and S. Benetti, Istituto Nazionale
di Astrofisica, Osservatorio Astronomico di Padova; and A. Pastorello,
Dipartimento di Astronomia, Universita di Padova, on behalf of a larger
collaboration, report that a spectrogram (range 390-810 nm; resolution 2.2 nm)
of SN 2011dc (cf. CBET 2726), obtained on June 7.00 UT with the Ekar-Copernicus
1.82-m telescope (+ AFOSC), confirms that it is a type-I supernova.  The
spectrum shows strong features of helium at 587.6 and 667.8 nm, typical of
type-Ib supernovae after maximum.  Cross-correlation of the observed spectrum
with a library of supernova spectra using the "GELATO" code (Harutyunyan et al.
2008, A.Ap. 488, 383, available at https://gelato.tng.iac.es/login.cgi) shows
that SN 2011dc is similar to 1999dn at one week after maximum (Benetti et al.
2011, MNRAS 411, 2726).


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                         (C) Copyright 2011 CBAT
2011 June 10                     (CBET 2739)              Daniel W. E. Green