Electronic Telegram No. 987
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 2007cs IN UGC 12798
     A. Harutyunyan, M. Turatto, S. Benetti, E. Cappellaro, and F.
Sabbadin, Istituto Nazionale di Astrofisica, Osservatorio Astronomico
di Padova; and W. Boschin, Telescopio Nazionale Galileo (TNG), report
that a spectrum of 2007cs (cf. CBET 986), obtained on June 27.11 UT
with the 3.5-m TNG (+ DOLORES; range 380-930 nm, resolution 1.3 nm),
shows it to be a type-Ia supernova with very high expansion velocity.
The best fit to this spectrum found by the "PASSparToo" supernova-
spectra-comparison tool (Harutyunyan et al. 2005, ASP Conf. Ser. 342,
258) is with that of the type-Ia supernova 1997bp at 19 days after
maximum.  In the spectrum, a strong Na I D interstellar absorption
doublet (equivalent width approximately 0.27 nm) is found in the host-
galaxy restframe, suggesting some dust extinction.


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                         (C) Copyright 2007 CBAT
2007 June 28                     (CBET 987)               Daniel W. E. Green