[IAUC] CBET 978: 20070608 : SUPERNOVA 2007co IN MCG +05-43-16

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                                                  Electronic Telegram No. 978
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 2007co IN MCG +05-43-16
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 350-740 nm) of 2007co
(cf. CBET 977), obtained on June 8.35 UT by M. Calkins with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-Ia
supernova around one week before maximum light.  Cross-correlation with a
library of supernova spectra indicates that 2007co is most similar to the
type-Ia supernova 1997dt at 7 days before maximum light.  Adopting a
recession velocity of 8083 km/s for the host galaxy (from The Updated Zwicky
Catalog, http://tdc-www.harvard.edu/uzc/), the maximum absorption in the Si
II line (rest 635.5 nm) is blueshifted by roughly 13000 km/s.


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                         (C) Copyright 2007 CBAT
2007 June 8                      (CBET 978)               Daniel W. E. Green