[IAUC] CBET 909: 20070327 : SUPERNOVA 2007az

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                                                  Electronic Telegram No. 909
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 2007az
      J. M. Silverman, R. Chornock, and A. V. Filippenko, University of
California, Berkeley, report that inspection of CCD spectra (range 340-920
nm), obtained on Mar. 18 UT with the Keck I 10-m telescope (+ LRIS), shows
that the possible supernova near UGC 4378 that was announced on CBET 872
is a type-Ib supernova (hereby designated 2007az).  The spectrum shows
conspicuous lines of He I (rest 587.6, 667.8, 706.5 nm) and closely
resembles the spectrum of SN 1999dn at 10 days after maximum (Matheson et
al. 2001, A.J. 121, 1648).  The host-galaxy's recession velocity,
calculated from narrow emission lines, was found to be 10420 km/s.  This
is nearly a factor of five larger than the recession velocity of the
nearby galaxy UGC 4378 (2230 km/s from Schneider et al. 1992, Ap.J. Suppl.
81, 5).  Thus, SN 2007az must reside in a background galaxy.


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                         (C) Copyright 2007 CBAT
2007 March 27                    (CBET 909)               Daniel W. E. Green