Central Bureau for Astronomical Telegrams

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IAUC 7593: 2001aa; 2001X; 2001Y; 2001Z

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                                                  Circular No. 7593
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 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2001aa IN UGC 10888
     G. M. Hurst, Basingstoke, England, reports the discovery by M.
Armstrong of an apparent supernova (mag about 18.0) on seven
unfiltered CCD frames taken from Mar. 5.124 to 5.222 UT.
Confirming images were obtained by Armstrong in poor conditions on
Mar. 6.1, showing the new object at mag 18.4.  SN 2001aa is located
at R.A. = 17h29m57s.71, Decl. = +60o21'23".2 (equinox 2000.0; mean
of four measurements), which is 10" west and 22" north of the
center of UGC 10888.  Nothing is visible at this location on
earlier CCD images taken by Armstrong on Jan. 13 (limiting mag
19.0) and 16 (limiting mag 19.5), neither is anything visible on
Palomar Sky Survey images taken on 1987 July 27 (limiting blue mag
22.5), 1992 May 10 (red mag 20.8), and 1992 June 20 (infrared mag
19.5).  A red star (mag 18.8) located 9" north of SN 2001aa is
listed in the USNO A2.0 catalogue.

     R. Chornock, W. D. Li, and A. V. Filippenko, University of
California at Berkeley, report that a spectrum of SN 2001X (cf.
IAUC 7591), obtained with the Lick Observatory Shane 3-m telescope
on Mar. 3.5 UT under poor conditions, shows a very blue continuum
with strong H Balmer lines, indicating that it is a type-II
supernova before maximum light.  The He I 587.6-nm line is also

     M. Phillips, G. Martin, and G. Valladares, Carnegie
Observatories, obtained a spectrum (range 350--850 nm) of SN 2001Y
(cf. IAUC 7592) on Mar. 5.35 UT with the 6.5-m Baade telescope at
Las Campanas Observatory.  The spectrum, which reveals broad H I
and Fe II emission lines on a strong, blue continuum, closely
resembles that of the peculiar type-II event SN 1999gk (see

     Phillips, Martin, and Valladares also obtained a spectrum of
SN 2001Z (cf. IAUC 7592) on Mar. 5.37 UT with the Baade telescope.
This shows weak, relatively narrow H-alpha and H-beta emission
lines on a strong, blue continuum, consistent with a type-II
supernova caught at a very early epoch.  The redshift of the
emission lines is z = 0.045.

                      (C) Copyright 2001 CBAT
2001 March 6                   (7593)            Daniel W. E. Green

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