Electronic Telegram No. 499
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2006bw
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis,
Harvard-Smithsonian Center for Astrophysics, report that a spectrum
(range 350-740 nm) of SN 2006bw (cf. CBET 497), obtained on May 2.31
UT by W. Brown with the F. L. Whipple Observatory 1.5-m telescope (+
FAST), shows it to be a type-Ia supernova, with a spectral-feature age
(Riess et al. 1997, A.J. 114, 722) of 6 days past maximum light.
Cross-correlation with a library of type-Ia-supernova spectra indicates
that SN 2006bw is at an approximate redshift of cz = 10000 km/s.
Adopting this recession velocity for the supernova, the maximum absorption
in the Si II line (rest 635.5 nm) is blueshifted by 12000 km/s.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2006 CBAT
2006 May 3                       (CBET 499)               Daniel W. E. Green