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IAUC 7470: 2000cz; C/1999 S4; 2000cx

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IAUC number

                                                  Circular No. 7470
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 2000cz IN IC 1535
     G. M. Hurst, Basingstoke, England, reports the discovery by M.
Armstrong, Rolvenden, Kent, of an apparent supernova (mag 18) on
four CCD patrol images (limiting mag 19-19.5) taken with a 0.30-m
reflector in the course of the U.K. Nova/Supernova Patrol on July
29.048-29.108 UT.  From a 60-s image obtained on July 29.981, in
which the new object still appears at mag 18 (limiting mag 19.5),
Armstrong reports the following precise position for SN 2000cz:
R.A. = 0h13m58s.19, Decl. = +48o09'14".4 (equinox 2000.0).  Nothing
appears at this position on four previous images of this galaxy
taken by Armstrong on 1999 Nov. 2 (limiting mag 19), and nothing
appears on second Palomar Sky Survey red (limiting mag 20.8) and
blue (limiting mag 22.5) plates.  Hurst adds that R. Arbour, South
Wonston, Hampshire, obtained a prediscovery image of SN 2000cz on
July 21.9.
     W. D. Li, University of California at Berkeley, reports that
SN 2000cz also appeared in images taken by the Katzman Automatic
Imaging Telescope on July 8.5 (mag about 17.7), 17.5 (mag about
17.9), and 27.5 UT (mag about 18.0).  From the image on July 27.5,
Li also measured the following position end figures for SN 2000cz:
58s.23, 14".2, which is 8".4 east and 14".9 south of the nucleus
of IC 1535.

     Further to their item on IAUC 7468, Filippenko and Chornock
report that full reduction of their CCD spectrum obtained on July
28 shows that CN emission near 380 nm is actually present; the CN
was not initially noticed in the two-dimensional spectrum because
it spans the entire slit, making it resemble a night-sky emission
line.  In contrast, the continuum (reflected sunlight) is visible
only on part of the slit, ending abruptly (as mentioned on IAUC

     V. Vlasyuk and N. Borisov, Special Astrophysical Observatory,
report that spectra (range 390-790 nm; resolution about 1.2 nm;
signal-to-noise ratio 50) of SN 2000cx (cf. IAUC 7458, 7463),
obtained over 60 min of exposure time with the 1-m reflector (+
long-slit spectrograph + CCD camera) on July 26.99 UT, reveal
spectral features and a spectral slope that are typical for type-Ia
supernovae, and in particular very similar to that of SN 1998aq
near maximum.

                      (C) Copyright 2000 CBAT
2000 July 30                   (7470)            Daniel W. E. Green

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