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IAUC 5652: 1992bi; 1992aa, 1992ab, 1992ax; N Sgr 1992 No. 3

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                                                  Circular No. 5652
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     C. Pennypacker, S. Perlmutter, G. Goldhaber, A. Goobar, J.
Desai, A. Kim, M. Kim, R. Muller, H. Newberg, and I. Small,
Lawrence Berkeley Laboratory and the Center for Particle Astrophysics,
Berkeley; B. Boyle and R. McMahon, Institute of Astronomy,
Cambridge; P. Bunclark, D. Carter, M. Irwin, and R. Terlevich,
Royal Greenwich Observatory; R. Ellis, University of Durham; and W.
Couch, University of New South Wales, report the detection of a
supernova with the Isaac Newton 2.5-m telescope during a search for
high-redshift supernovae.  The supernova is at R.A. = 16h08m28s.40,
Decl. = +39 54'57".7 (equinox 1950.0), and is 1".5 east and 0".5
north of the core of the host galaxy.  The supernova was discovered
at magnitude R = 22 on an Apr. 21 image, and then confirmed on
images from Apr. 24, 28, May 2, 7, 9, and 11.  Two previous reference
images from Mar. 25 and 27, and later follow-up images on June
10 (T. Small and J. Mould, Palomar 5-m reflector), July 6 (C.
Crawford and R. Abraham, Isaac Newton telescope), and Aug. 21 and
22, all show no supernova to a limit of mag about 24.  The photometry
points and upper limits indicate SN 1992bi to be a type-Ia
supernova, with an implied redshift of about 0.45.  On Aug. 21, the
spectrum of the host galaxy was observed at the William Herschel
4.2-m telescope by K. Glazebrook (Durham) and the redshift measured
to be 0.457.

SUPERNOVAE 1992aa, 1992ab, 1992ax
     D. D. Balam, University of Victoria, reports his astrometric
measurements of supernovae (equinox 1950.0) from CCD images obtained
by F. D. A. Hartwick, G. C. L. Aikman, and himself with the
1.85-m telescope of the Dominion Astrophysical Observatory:  SN
1992aa in NGC 6464 (IAUC 5534), R.A. = 17h45m13s.30, Decl. =
+60 54'42".2; SN 1992ab in NGC 6389 (ibid.), R.A. = 17h30m30s.93,
Decl. = +16 25'49".6; SN 1992ax in anonymous galaxy (IAUC 5607),
R.A. = 22h08m24s.27, Decl. = +44 47'44".5 (host galaxy has end
figures 23s.98, 48'04".5).

     Visual magnitude estimates:  Oct. 18.45 UT, 8.1 (D. Seargent,
The Entrance, N.S.W.); 24.40, 8.6 (Seargent); 26.70, 9.1 (M.
Tombelli, Montelupo, Italy); Nov. 4.72, 10.0 (A. Boattini,
Florence, Italy).

1992 November 12               (5652)            Daniel W. E. Green

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