[IAUC] CBET 582: 20060721 : SUPERNOVA 2006dt IN NGC 5681

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                                                  Electronic Telegram No. 582
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 2006dt IN NGC 5681
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis,
Harvard-Smithsonian Center for Astrophysics, report that a spectrum
(range 350-740 nm) of SN 2006dt (cf. CBET 581), obtained on July
21.22 UT by M. Calkins with the F. L. Whipple Observatory 1.5-m
telescope (+ FAST), shows it to be a type-Ia supernova around
maximum light.  Cross-correlation with a library of type-Ia
supernova spectra indicates that SN 2006dt is most similar to SN
1998aq (Branch et al. 2003, A.J. 126, 1489) at maximum.  Adopting a
recession velocity of 7899 km/s for the host galaxy (from The
Updated Zwicky Catalog, http://tdc-www.harvard.edu/uzc/), the
maximum absorption in the Si II line (rest 635.5 nm) is blueshifted
by roughly 11000 km/s.


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                         (C) Copyright 2006 CBAT
2006 July 21                     (CBET 582)               Daniel W. E. Green