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IAUC 8667: 2006U, 2006V, 2006W, 2006X

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                                                  Circular No. 8667
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVAE 2006U, 2006V, 2006W, 2006X
     Four apparent supernovae have been discovered on CCD exposures:
2006U and 2006W by the Lick Observatory Supernova Search (by N. J.
Ponticello, J. Burket, and W. Li via KAIT images; cf. IAUC 8664),
2006V by Y.-T. Chen, M. Yang, and C.-S. Lin in the course of the
Taiwan Supernova Survey (cf. IAUC 8567), and 2006X independently by
Shoji Suzuki (Ooami-Shirasato, Chiba, Japan, via twelve CCD frames
taken on Feb. 4 with a 0.32-m f/9 telescope + SBIG infrared-cut
filter; communicated via M. Soma, National Astronomical Observatory
of Japan) and by M. Migliardi (Cortina, Italy, via the CROSS
program; cf. IAUC 7373; source of the tabulated data below for
2006X; communicated by A. Dimai).

SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2006U   Feb. 3.44    9 53 45.38  +23 20 35.1  18.8      --
2006V   Feb. 4.67   11 31 30.01  - 2 17 52.2  18.0  32".1 W, 40".4 N
2006W   Feb. 5.54   14 27 26.09  +25 31 09.8  16.6  1".2 E, 17".5 N
2006X   Feb. 7.10   12 22 53.99  +15 48 33.1  15.3  12" W, 48" S

Additional unfiltered KAIT magnitudes of 2006U (which is
superimposed on a faint galaxy):  2005 Dec. 4.45 UT, [19.6; 14.43,
[18.9; 2006 Jan. 5.45, [18.9; Feb. 4.36, 18.8.  Additional
approximate unfiltered magnitudes of 2006V in UGC 6510:  2005 Dec.
21.848, [18.8; 2006 Feb. 6.648, 18.2.  Additional unfiltered KAIT
magnitudes of 2006W in UGC 9265:  2005 July 14.22, [19.0; 2006 Feb.
6.48, 16.7.  Additional approximate CCD magnitudes for 2006X in NGC
4321 (= M100):  Jan. 3, [20 (Suzuki; magnitudes estimated by Soma);
13, [18.5 (CROSS; unfiltered images); Feb. 4.747, 17 (Suzuki).
Dimai adds that 2006X does not appear on Palomar Sky Survey
infrared, red, and blue plates.  Soma provides his rough
measurement of the position end figures for 2006X from Suzuki's
discovery frame:  53s, 48'.5.
     H. Navasardyan, S. Benetti, A. Harutyunyan, F. Bufano, N.
Elias-Rosa, L. Zampieri, M. Turatto, and E. Cappellaro, Istituto
Nazionale di Astrofisica and Osservatorio Astronomico di Padova,
report that a spectrogram (range 370-780 nm) of SN 2006W, obtained
on Feb. 7.167 UT with the Copernicus 1.82-m telescope (+ AFOSC),
shows it to be a type-II supernova.  The spectrum is very similar
to that of the bright type II-"linear" supernova 1980K (Barbon et
al. 1982, A.Ap. 116, 35), about 3 weeks after maximum light.  The
spectrum displays broad P-Cyg profiles from the Balmer series, but
H_alpha shows only a broad (FWHM about 7400 km/s) asymmetric
emission component.

                      (C) Copyright 2006 CBAT
2006 February 7                (8667)            Daniel W. E. Green

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