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IAUC 6779: SNe; GS 1354-64

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                                                 Circular No. 6779
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVAE
     The High-Z Supernova Search Team (IAUC 6160, 6646) reports the
discovery of five supernovae on CCD images taken at the Canada-
France-Hawaii Telescope by P. Garnavich, Harvard-Smithsonian Center
for Astrophysics (CfA); and H. Dahle, G. Luppino, and D. Clowe,
University of Hawaii (UH).  The supernovae were identified by B.
Schmidt, Mount Stromlo and Siding Spring Observatories; J. Tonry,
UH; and P. Challis, CfA, by subtracting images taken during Sept.
26-30 UT from those obtained on Oct. 29-Nov. 1.  The limiting
magnitude for both the template and search frames was I about 24.5.
The supernovae were confirmed on images taken with the WIYN
telescope on Nov. 4-5.

SN        1997 UT       R.A.  (2000)  Decl.      I      z    type
1997dv    Oct. 29    4 15 00.01  + 5 32 06.1    23.0    ?     ?
1997dw    Oct. 29    4 14 49.05  + 5 54 51.9    21.2    ?     ?
1997dx    Oct. 29    1 38 21.10  -12 43 22.8    22.5   0.21   Ia
1997dy    Nov.  1    4 16 35.32  + 5 47 03.1    23.9
1997dz    Nov.  1    1 56 03.69  -13 43 06.4    22.3

The supernovae are within 1" of their host galaxies except SN
1997dx, which is 2".2 west and 0".8 north.  Spectra of SNe 1997dv,
1997dw, and 1997dx were obtained under poor conditions with the
Multiple-Mirror Telescope on Nov. 4-5 by P. Challis and S. Jha
(CfA).  Finder charts may be requested by sending electronic mail
to pgarnavich@cfa.harvard.edu.


GS 1354-64
     R. P. Fender, Astronomical Institute 'Anton Pannekoek',
University of Amsterdam; S. J. Tingay, Jet Propulsion Laboratory,
NASA; and J. Higdon, R. Wark, and M. Wieringa, Australia Telescope
Compact Array (ATCA) Alert Team, report:  "We have detected a
probable radio counterpart to the blackhole-candidate x-ray
transient GS 1354-64, which is undergoing an x-ray and optical
outburst (IAUC 6772, 6774, 6775).  The radio counterpart lies
within 1".5 of the optical coordinates.  The source has been
detected with the ATCA on both Nov. 20/21 and Nov. 24/25 at a level
of 1-3 mJy, at frequencies of 2.5, 4.8, and 8.6 GHz.  The radio
spectrum on Nov. 24/25 corresponds to optically-thin synchrotron
emission with a spectral index of about -0.5 and may have evolved
from a more absorbed state on Nov. 20/21."

                      (C) Copyright 1997 CBAT
1997 November 28               (6779)            Daniel W. E. Green

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