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IAUC 8008: 2002hl; 2002hj; RADIO TRANSIENT IN Sco

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                                                  Circular No. 8008
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 2002hl IN NGC 3665
     T. Boles, Coddenham, England, reports the discovery of an
apparent supernova on an unfiltered CCD images taken on Nov. 4.236
(mag 16.3) and 5.083 UT (mag 16.5) with a 0.35-m reflector in the
course of the U.K. Nova/Supernova Patrol.  The new object is
located at R.A. = 11h24m40s.12, Decl. = +38o46'03".0 (equinox
2000.0), which is approximately 42".0 west and 16".6 north of the
center of NGC 3665.  SN 2002hl is not present on Boles' images from
Apr. 4 (limiting mag 18.5), 19, or June 1, or on Palomar Sky Survey
red and blue plates.

     R. Chornock, S. Jha, and A. V. Filippenko, University of
California at Berkeley; and B. Barris, University of Hawaii, report
that inspection of a spectrum (range 400-1000 nm), obtained on Nov.
2.4 UT with the Keck II 10-m telescope (+ ESI), reveals that SN
2002hj (cf. IAUC 8006) is a supernova of type II.  Well-developed
P-Cyg lines of the H Balmer series, Fe II, O I, and Ca II are
present on a blue continuum.  Narrow H-alpha emission from the host
galaxy at the position of the supernova is present at a redshift of
7090 km/s.  The absorption minimum of H-beta has an expansion
velocity of 8900 km/s.

     O. B. Slee, G. S. Tsarevsky, and R. J. Sault, Australia
Telescope National Facility; M. P. Rupen, V. Dwahan, and A. J.
Mioduszewski, National Radio Astronomy Observatory; and D.
Campbell-Wilson and R. Deacon, University of Sydney, report that
the microquasar candidate reported as a radio transient by Rupen et
al. on IAUC 7968 was previously detected in 2000 and 2001 by the
Australia Telescope Compact Array (ATCA) as a 12.3-mJy, flat-
spectrum radio source and showed a high level of variability.
Further ATCA, Very Large Array, and MOST-satellite observations,
spanning 843 MHz to 8.6 GHz during 2002 Sept. 3-Oct. 8, show that
the new flare had a flat spectrum between 4.8 and 8.6 GHz and
reached its peak of 7.2 mJy near Sept. 15, dropping to below the
detection level of 0.3 mJy by Oct. 8.  The flux density at 843 MHz
was 1.5 mJy on Sept. 17, showing that source was optically thick at
low frequencies.  Tsarevsky et al. (URL given on IAUC 7968)
identified this source with a relatively bright star (R = 11.4)
having strong, variable H-alpha emission.  Further multi-wavelength
studies of this object are requested.

                      (C) Copyright 2002 CBAT
2002 November 4                (8008)            Daniel W. E. Green

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