Electronic Telegram No. 963
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 2007ch in NGC 6000
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 350-740 nm) of
2007ch (cf. CBET 961), obtained by P. Berlind on May 15.34 UT with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-II
supernova roughly 2-3 weeks past explosion, confirming the classification
given at http://www.astronomerstelegram.org/?read=1073 by Gal-Yam and Ellis.
The spectrum is similar to that of the type-II-plateau supernova 2005cs at
17 days past explosion.  Adopting a recession velocity of 2110 km/s for the
host galaxy (from de Vaucouleurs et al. 1991, Third Ref. Cat. of Bright
Galaxies), the maximum absorption in the H_beta line (rest 486.1 nm) is
blueshifted by roughly 6000 km/s.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 May 15                      (CBET 963)               Daniel W. E. Green