Electronic Telegram No. 846
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 2007W IN NGC 5105
     R. J. Foley, J. M. Silverman, R. Chornock, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD spectra
(range 440-940 nm), obtained on Feb. 16 UT with the Keck II 10-m telescope
(+ DEIMOS), shows that 2007W (cf. CBET 844) is a type-II supernova.
Hydrogen Balmer lines having P-Cyg profiles are present, although the
emission component of H-alpha greatly dominates over the main absorption
component.  Removing a recession velocity of 2902 km/s (Ragaigne et al.
2003, A.Ap. 408, 465), the minimum of the H-alpha absorption is
blueshifted by 7400 km/s.  There is a second absorption blueshifted by
13800 km/s, similar to that seen in SN 1999em at day 7 (Leonard et al.
2002, PASP 114, 35).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 February 16                 (CBET 846)               Daniel W. E. Green