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IAUC 7830: 2000fs; 2001gd

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                                                  Circular No. 7830
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)


SUPERNOVA 2000fs IN NGC 1218
     A. R. Martel, Johns Hopkins University, and collaborators
report the discovery of a supernova (V = 18.7) in NGC 1218 (z =
0.0286), which is host to the radio source 3C 78.  The supernova
was detected on 2000 Sept. 6 UT in an acquisition image (filter
F28X50LP) and spectrum of the galaxy's core, obtained as part of
the Hubble Space Telescope (HST) spectroscopic program GO-8700 with
the Space Telescope Imaging Spectrograph (STIS).  SN 2000fs is
located at R.A. = 3h08m26s.24, Decl. = +4 06'39".9 (equinox 2000.0),
which is approximately 0".5 northeast of the galaxy's nucleus.  The
new object is superimposed along the northern edge of the optical
synchrotron jet of 3C 78.  Comparison with HST WFPC2 images taken
on 1994 Aug. 17 (red F702W filter) and 1996 Sept. 16 (blue F555W
filter) shows no evidence of the supernova.  The STIS spectra
(range 282.5-998.0 nm) of the supernova appear generally
consistent with a type-Ia event, with the Ca II triplet, Mg II, Si
II, and Fe II lines detected.


SUPERNOVA 2001gd IN NGC 5033
     C. J. Stockdale, Naval Research Laboratory (NRL); M. A. Perez-
Torres, Istituto di Radioastronomia, Bologna; J. M. Marcaide,
University of Valencia; R. A. Sramek, National Radio Astronomy
Observatory; K. W. Weiler, NRL; S. D. Van Dyk, Infrared Processing
and Analysis Center, California Institute of Technology; N.
Panagia, European Space Agency and Space Telescope Science
Institute; P. Lundqvist, Stockholm University; D. Pooley,
Massachusetts Institute of Technology (MIT); S. Immler, University
of Massachusetts, Amherst; and W. Lewin, MIT, report the detection
of radio emission from the type-IIb supernova 2001gd (IAUC 7761,
7765) with the Very Large Array.  Radio-flux densities on Feb. 8.54
UT of 1.37 +/- 0.18 mJy at 22.485 GHz (wavelength 1.3 cm), 4.09 +/-
0.21 mJy at 8.435 GHz (wavelength 3.6 cm), 5.05 +/- 0.26 mJy at
4.885 GHz (wavelength 6.1 cm), and 0.85 +/- 0.13 mJy at 1.465 GHz
(wavelength 20.5 cm) were measured in 'A' configuration at the
following position:  R.A. = 13h13m23s.899, Decl. = +36o38'18".14
(equinox J2000; +/- 0".2 in each coordinate).  This is in close
agreement with the reported optical position (end figures 23s.89,
17".7; IAUC 7761).  NGC 5033 is also the host galaxy of SNe 1985L
and 1950C, from which no radio emission was detected in these
observations (with 1.465 GHz 3-sigma upper limits of 0.261 mJy to
each observation).

                      (C) Copyright 2002 CBAT
2002 February 15               (7830)            Daniel W. E. Green

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