[IAUC] CBET 1723: 20090315 : SUPERNOVA 2009as IN ESO 447-37

[IAUC mailing list]

                                                  Electronic Telegram No. 1723
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2009as IN ESO 447-37
     R. Covarrubias, Observatories of the Carnegie Institution of Washington
(OCIW) and Anglo Australian Observatory; and N. Morrell, OCIW and the Carnegie
Supernova Project, report that a spectroscopic observation (range 400-1000 nm)
of 2009as (cf. CBET 1717), obtained on Mar. 15.4 UT with the Magellan II Clay
telescope (+ LDSS3) at Las Campanas Observatory, shows this to be a type-Ia
supernova.  Cross-correlation with a library of supernova spectra, using the
"Supernova Identification" code (SNID; Blondin and Tonry, 2007, Ap.J. 666,
1024), gives a very good match with several normal type-Ia supernovae between
10 and 14 days after maximum.  Adopting the NED recession velocity for the
host galaxy of 6649 km/s (Theureau et al. 2007, A.Ap. 465, 71), the minimum
of the Si II 635.5-nm absorption reveals an expansion velocity of
approximately 11700 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 March 15                    (CBET 1723)              Daniel W. E. Green