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IAUC 8059: 2003U; 2003M; 2002gz

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IAUC number

                                                  Circular No. 8059
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)

     Further to IAUC 8057, T. Boles reports the discovery of an
apparent supernova (mag 18.0) on an unfiltered CCD image taken on
Jan. 27.153 and 28.069 UT.  The new object is located at R.A. =
17h22m45s.66, Decl. = +62o09'50".4, which is approximately 12".7
east and 7".3 south of the center of NGC 6365A.  SN 2003U is not
present on Boles' images from 2002 Sept. 10 (limiting mag 19.0),
Aug. 15, or July 26, and it is not present on Palomar Sky Survey
red (1993) and blue (1989) plates.

     Further to IAUC 8058, T. Matheson et al. add that a spectrum
of SN 2003M, obtained by M. Calkins on Jan. 26.38 UT, shows it to
be an unusual type-Ia supernova (not type Ic, as suggested on IAUC
8057):  "As UGC 7224 is an elliptical galaxy, this would be an
extraordinary event if it were a core-collapse supernova.  The
spectrum is like that of SN 2002jm (cf. IAUC 8031), reported by
Foley et al. as similar to SN 1991bg at 3 weeks past maximum, but
without the Na I D absorption seen in SN 1991bg."

     M. Hamuy and M. Phillips, Carnegie Observatories; and J. Maza,
University of Chile, report spectroscopic observations (range 320-
920 nm) made of SN 2002gz between 2002 Oct. 29 and 2003 Jan. 10 UT
with the Las Campanas Observatory Baade 6.5-m and Dupont 2.5-m
telescopes:  "A spectrum obtained on Nov. 10 bears some resemblance
to that of the type-Ic supernova 1994I taken 4 days before maximum
(Filippenko 1997, ARAA 35, 309), though a few differences are
evident, such as (1) SN 2002gz was much bluer and showed no
evidence for interstellar Na I D 589.3-nm absorption; (2) the Ca H
and K lines in SN 2002gz were much weaker; and (3) the BVI light
curves of SN 2002gz appear to have been already declining by this
date (i.e., our spectrum most likely was obtained after maximum).
By Jan. 10, SN 2002gz began to show Na I D absorption, and the
spectrum was similar to that of SN 1994I taken 26 days after
maximum, but the Ca H and K lines in SN 2002gz were weak.  The
first spectrum of SN 2002gz obtained on Oct. 29 has a very blue
continuum, broad low-contrast undulations, and a weak emission at
the approximate position expected for H-alpha -- perhaps suggesting
an intermediate IIc type.  An intermediate IIb type, as suggested
on IAUC 8014 seems unlikely, since none of the spectra of SN 2002gz
show evidence for strong He I lines."

                      (C) Copyright 2003 CBAT
2003 January 28                (8059)            Daniel W. E. Green

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