[IAUC] CBET 948: 20070428 : SUPERNOVA 2007bg

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                                                  Electronic Telegram No. 948
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 2007bg
     A. Harutyunyan, S. Benetti, and M. Turatto, Istituto Nazionale di
Astrofisica; A. Pastorello, D. Young, and S. J. Smartt, Queen's
University, Belfast; S. Valenti, European Southern Observatory,
Garching; and G. Andreuzzi, Telescopio Nazionale Galileo (TNG), report
that inspection of a spectrum of SN 2007bg, obtained on Apr. 21.04 UT
with the 3.5-m TNG (+ DOLORES), confirms the resemblance to type-Ic
supernovae/hypernovae (as reported on CBET 927).  The spectrum is
dominated by a broad and strong feature centered at about 652.4 nm.
If it is identified with H-alpha, possibly blended with Si II, SN
2007bg might be classified as an energetic type-II supernova, similar
to SN 2003bg (Hamuy et al. 2003, IAUC 8088).  Thus, the position of
the minimum of H-alpha would indicate an expansion velocity of about
18000 km/s.  Also, He I lines, at a slightly lower velocity (14000
km/s), are possibly detected.


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                         (C) Copyright 2007 CBAT
2007 April 28                    (CBET 948)               Daniel W. E. Green