Electronic Telegram No. 492
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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SUPERNOVAE 2006bh AND 2006bn
     N. Morrell, G. Folatelli, M. Roth, and S. Gonzalez, on behalf of the
Carnegie Supernova Project, report that spectroscopic observations (range
380-920 nm) of SN 2006bh (cf. IAUC 8697, CBET 457) obtained on Apr. 24.40
UT and of SN 2006bn (cf. IAUC 8699, CBET 467) on Apr. 23.29 and 26.22,
with the WFCCD spectrograph attached to the 2.5-m du Pont telescope at
Las Campanas Observatory, reveal that both are type-Ia supernovae.  A
spectral-feature age (Riess et al. 1997, A.J. 114, 722) of 14 days past
maximum was derived for SN 2006bh.  The spectrum of SN 2006bn resembles
those of SN 1999bv (Matheson et al. 2001, A.J. 121, 1648) and SN 1996X at
57 days past maximum light, as determined by means of the 'superfit'
supernova-spectrum-comparison code (Howell et al. 2005, Ap.J. 634, 1190).
SN 2006bn is thus classified as a type-Ia supernova, 2 or 3 months past
maximum.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 April 29                    (CBET 492)               Daniel W. E. Green