Electronic Telegram No. 1037
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2007go IN ESO 475-G16
     R. J. Foley, M. Ganeshalingam, F. J. D. Serduke, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD spectra
(range 340-1000 nm), obtained on Aug. 14 UT with the 3-m Shane telescope
(+ Kast) at Lick Observatory, shows that 2007go (CBET 1028) is a type-Ib
supernova, very roughly 1 week past maximum brightness.  He I absorption
lines are probably present, and there is a reasonably good resemblance to
the spectrum of the type-Ib supernova 1998dt (cf. IAUC 7006, 7011) taken 8
days past maximum (Matheson et al. 2001, A.J. 121, 1648), though it is
still possible that 2007go is of type Ic.  There is a weak absorption line
that might be H-alpha, indicating an expansion velocity of about 15000
km/s.  The recession velocity of the host galaxy, determined from the
narrow emission lines of a superposed H II region, is 6900 km/s.


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                         (C) Copyright 2007 CBAT
2007 August 18                   (CBET 1037)              Daniel W. E. Green