Electronic Telegram No. 921
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 2007bf IN UGC 9121
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 350-740 nm) of
2007bf (cf. CBET 919), obtained by M. Calkins on Apr. 11.35 UT with the F.
L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-II
supernova roughly one week past explosion.  The spectrum consists of a blue
continuum and P-Cyg lines of the Balmer series, consistent with the plateau
phase of a normal type-II supernova.  The spectrum is similar to the
type-II-plateau supernova 1999em at 10 days past explosion.  Adopting a
recession velocity of 5326 km/s for the host galaxy (from The Updated
Zwicky Catalog, http://tdc-www.harvard.edu/uzc/), the maximum absorption in
the H_alpha line (rest 656.3 nm) is blueshifted by roughly 11500 km/s.


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                         (C) Copyright 2007 CBAT
2007 April 11                    (CBET 921)               Daniel W. E. Green