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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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