[IAUC] CBET 998: 20070711 : SUPERNOVA 2007fc IN ESO 538-G8

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                                                  Electronic Telegram No. 998
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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SUPERNOVA 2007fc IN ESO 538-G8
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics report that a spectrogram (range 350-740 nm) of
2007fc (cf. CBET 995), obtained by M. Calkins on July 11.47 UT with the F.
L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-Ia
supernova around one week past maximum light.  Cross-correlation with a
library of supernova spectra indicates that 2007fc is most similar to the
type-Ia supernova 2003du at 10 days past maximum.  Adopting a recession
velocity of 10116 km/s for the host galaxy (from de Vaucouleurs et al. 1991,
Third Ref. Cat. of Bright Galaxies), the maximum absorption in the Si II
line (rest 635.5 nm) is blueshifted by roughly 11000 km/s.  Also,
interstellar Na I D absorption at the redshift of the host galaxy is visible
in the spectrum, although its equivalent width is difficult to measure
accurately due to the low signal-to-noise ratio of the spectrum.


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                         (C) Copyright 2007 CBAT
2007 July 11                     (CBET 998)               Daniel W. E. Green