[IAUC] CBET 932: 20070420 : SUPERNOVA 2007bj IN NGC 6172

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                                                  Electronic Telegram No. 932
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2007bj IN NGC 6172
     S. Benetti, A. Harutyunyan, I. Agnoletto, M. Turatto, and H.
Navasardyan, Osservatorio Astronomico di Padova, INAF; J. P. Troncin,
Observatoire de Haute-Provence (OHP); A. Boselli, Laboratoire
d'Astrophysique de Marseille; and M. Dennefeld, Insitut d'Astrophysique
de Paris, report that a spectrogram of 2007bj (cf. CBET 930), obtained on
Apr. 20.11 UT with the OHP 1.93-m telescope (+ Carelec spectrograph; range
370-700 nm, resolution 0.6 nm), shows it to be a type-Ia supernova.
Assuming a recession velocity of 5009 km/s (Denicolo et al. 2005, MNRAS
356, 1440; via NED) for the host galaxy, the 'PASSparToo' comparison code
(Harutyunyan et al. 2005, ASP Conf. Ser. 342, 258) provides the best fit
with a spectrum of the 1991T-like supernova 1997br around 9 days after
maximum light.  However, the Si II 635.5-nm absorption feature --
although blueshifted (expansion velocity about 11900 km/s, faster than
expected for the derived phase) -- has a narrow profile.


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                         (C) Copyright 2007 CBAT
2007 April 20                    (CBET 932)               Daniel W. E. Green