[IAUC] CBET 857: 20070223 : SUPERNOVA 2007ad IN UGC 10845

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                                                  Electronic Telegram No. 857
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2007ad IN UGC 10845
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 350-740 nm) of SN
2007ad (cf. CBET 854), obtained by K. Rines on Feb. 23.55 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 7 days past explosion.  Adopting a recession
velocity of 8260 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 February 23                 (CBET 857)               Daniel W. E. Green