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IAUC 8707: 2006bq, 2006bu, 2006by, 2006bz, 2006ca

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                                                  Circular No. 8707
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
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SUPERNOVAE 2006bq, 2006bu, 2006by, 2006bz, 2006ca
     Three additional supernovae have been found in LOSS/KAIT images
(cf. IAUC 8705) by E. Lee, R. Chornock, J. Burket, M. Baek, and W.

SN      2006 UT     R.A.  (2000.0)  Decl.    Mag.     Offset
2006by  May 3.31   13 26 09.12  +35 55 58.0  18.2  0".1 E, 5".7 S
2006bz  May 4.30   13 00 43.38  +27 57 41.8  17.5  7".0 E, 5".9 S
2006ca  May 4.49   18 22 54.15  +12 26 03.2  16.4  14".0 E, 17".3 N

Additional magnitudes for 2006by in NGC 5149:  Feb. 9.50 UT, [19.0;
May 4.31, 18.2.  Additional magnitudes for 2006bz in PGC 44809 (in
Abell Cluster 1656):  Jan. 13.46, [18.5; Feb. 5.43, [18.0; May 5.37,
17.1.  Additional magnitudes for 2006ca in UGC 11214:  2005 Oct.
5.19, [19.0; 2006 Apr. 14.53, [17.0; May 5.40, 16.1.  Additional
KAIT magnitudes for 2006bq (cf. IAUC 8705):  2005 Oct. 5.20, [19.5;
2006 May 4.52, 16.8; 5.40, 17.0.
     R. J. Foley, J. M. Silverman, M. Moore, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD
spectra (range 330-1040 nm), obtained on May 5 UT with the Lick 3-m
telescope (+ Kast), shows that SNe 2006bq and 2006bu (cf. IAUC 8705)
are of type Ia at about 20 and 0 days past maximum brightness,
respectively.  Spectra of SNe 2006by and 2006ca reveal they are both
of type II.  The spectrum of SN 2006ca shows a very blue continuum
with weak Balmer absorption lines, indicating that it is a young
object.  After removing the recession velocity of 5680 and 2670 km/s
determined from narrow emission lines, the minima of the H_alpha
P-Cyg absorption is seen to have velocities of 7600 and 17200 km/s
for SNe 2006by and 2006ca, respectively.  A spectrum of SN 2006bz
shows it to be of type Ia, resembling SN 1991bg (Filippenko et al.
1992, A.J. 104, 1543) at maximum light; removing the host-galaxy
recession velocity of 8366 km/s (Caldwell et al. 1992, A.J. 106,
473), the minimum of the Si II 6150 absorption is measured to be
10800 km/s.
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis,
Harvard-Smithsonian Center for Astrophysics, report that a
spectrum (range 350-740 nm) of 2006bu, obtained on May 5.19 UT by
W. Peters with the Mt. Hopkins 1.5-m telescope (+ FAST), shows it
to be a type-Ia supernova with a spectral-feature age (Riess et al.
1997, A.J. 114, 722) of 2 days past maximum.  Cross-correlation
with a library of type-Ia-supernova spectra indicates that 2006bw
is at a redshift of cz approximately 25000 km/s.  Adopting this
recession velocity for the supernova, the maximum absorption in the
Si II line (rest 635.5 nm) is blueshifted by 11500 km/s.

                      (C) Copyright 2006 CBAT
2006 May 5                     (8707)            Daniel W. E. Green

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