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IAUC 7716: SNe; 2001du

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                                                  Circular No. 7716
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVAE
     R. Chornock, W. D. Li, and A. V. Filippenko, University of
California at Berkeley, report that inspection of CCD spectra
(range 330-1000 nm) obtained on Sept. 12 UT with the Shane 3-m
reflector at Lick Observatory reveals that SN 2001ef (IAUC 7710) is
a supernova of type Ic, not type Ia (cf. IAUC 7714); the spectrum
resembles that of SN 1994I (Filippenko 1997, Ann. Rev. Astron.
Astrophys. 35, 309), about a week past maximum brightness.  Spectra
obtained as above show that SN 2001dn (IAUC 7681) is a supernova of
type Ia, about a month past maximum brightness.  SN 2001dt (IAUC
7689), SN 2001dw (IAUC 7691), and SN 2001ec (IAUC 7702) are type-Ia
supernovae, several weeks past maximum brightness.  Superposed
narrow emission lines of the host galaxy of SN 2001ec are at
redshift cz approximately 14 000 km/s.  SN 2001eg (IAUC 7712) is
type-Ia supernova, several months past maximum brightness.  SN
2001dy (IAUC 7693) is a type-II supernova, a few weeks past maximum
brightness.  SN 2001dz (IAUC 7696) and SN 2001ea (IAUC 7696) are
supernovae of type II, probably not long after maximum light,
although the H-alpha emission component substantially dominates
over the absorption.  SN 2001ee (IAUC 7705) is a type-II supernova
several months past maximum light.  Chornock and Filippenko add
that a CCD spectrum (range 330-1000 nm) of SN 2001dx (IAUC 7692)
obtained on Sept. 11 reveals that the object is of type II, with
the usual P-Cyg profiles of hydrogen.
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
2001ec, obtained by P. Berlind on Sept. 12.44 UT with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST spectrograph), shows it
to be a type-I supernova, but it is unclear if it is of type Ic
near maximum light or type Ia several weeks past maximum light.
Narrow H-alpha emission from the nucleus indicates a recession
velocity of 13 600 km/s for the host galaxy.


SUPERNOVA 2001du IN NGC 1365
     A. J. Beasley and J. M. Carpenter, Owens Valley Radio
Observatory, California Institute of Technology, write:  ''Radio
observations of SN 2001du (IAUC 7690, 7692, 7704, 7705) using the
Owens Valley Millimeter Array at 90 GHz on Aug. 27 (five antennas)
and Sept. 4 (four antennas) place 3-sigma upper limits of 11 and
14 mJy (respectively) on any high-frequency radio emission
associated with the supernova."

                      (C) Copyright 2001 CBAT
2001 September 12              (7716)            Daniel W. E. Green

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