Electronic Telegram No. 489
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2006ay
     G. Folatelli, N. Morrell, M. M. Phillips, and C. Contreras, on behalf of
the Carnegie Supernova Project, report that a spectrogram (range 380-920 nm)
of SN 2006ay (cf. IAUC 8691), obtained on Mar. 23.28 UT with the Las
Campanas 2.5-m du Pont telescope (+ WFCCD spectrograph), shows this to be a
type-Ia supernova with an age of about 20-25 days after maximum light.  Using
the supernova spectrum comparison code 'superfit' of Howell et al. 2005 (Ap.J.
634, 1190), an approximate redshift of 0.09 was determined, which is
significantly higher than that of the compact group of galaxies ("Seyfert's
Sextet") that appears near the supernova location.  Inspection of an image
from the "Atlas and Catalog of Interacting Galaxies" (Vorontsov-Velyaminov
1959, Moscow State University), available from the NASA/IPAC Extragalactic
Database (NED), shows a faint object close to the position of the supernova
that may be the host galaxy.


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                         (C) Copyright 2006 CBAT
2006 April 28                    (CBET 489)               Daniel W. E. Green