Electronic Telegram No. 838
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 2007U IN ESO 552-65
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 350-740 nm) of
2007U (cf. CBET 835), obtained by P. Berlind on Feb. 8.15 UT with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-II
supernova roughly 2 weeks 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 2004et at 13 days past explosion.  Adopting a
recession velocity of 7801 km/s for the host galaxy (from de Vaucouleurs et
al. 1991, Third Ref. Cat. of Bright Galaxies, ver. 3.9), the maximum
absorption in the H_beta line (rest 486.1 nm) is blueshifted by roughly
10500 km/s.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2007 CBAT
2007 February 8                  (CBET 838)               Daniel W. E. Green