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IAUC 6728: GRB 970828; 1997de; C/1997 O1

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                                                 Circular No. 6728
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


GRB 970828
     D. Smith, A. Levine, R. Remillard, and A. Wood, Massachusetts
Institute of Technology, communicate:  "A refined analysis of the
RXTE ASM observations of GRB 970828 (described on IAUC 6726), using
the two 90-s observations simultaneously, yields a best-fit
location and 90-percent confidence ellipse.  The center of this
ellipse lies at the position reported on IAUC 6726; its axes lie
along the local R.A. and Decl. lines, such that its major axis
spans 5'.0 in R.A. and its minor axis 2'.0 in Decl.  This 90-
percent-confidence ellipse includes an estimate of the systematic
errors added in quadrature, and it is smaller than the 1-sigma
error region reported previously."
     K. Hurley, Space Sciences Laboratory, Berkeley, on behalf of
the Ulysses Gamma-Ray Burst Team; C. Kouveliotou, G. Fishman, C.
Meegan, and V. Connaughton, on behalf of the Gamma Ray Observatory
BATSE Team; and J. van Paradijs, University of Amsterdam and
University of Alabama in Huntsville, report:  "A preliminary
triangulation has been done using Ulysses and BATSE data.  The
resulting position is an annulus whose half-width is conservatively
estimated to be 0.027 deg at 3-sigma confidence, centered at R.A. =
10h46m13s, Decl. = +19o10'.3 (equinox 2000.0), with central radius
83.518 deg.  This annulus passes through the corners of the RXTE
error box (IAUC 6726) but does not reduce its size substantially.
The annulus is therefore also consistent with the RXTE PCA source
reported on IAUC 6727.  Further processing will reduce the annulus
width."


SUPERNOVA 1997de IN NGC 6769
     G. J. Garradd, Loomberah, N.S.W., reports the following
precise position for SN 1997de (cf. IAUC 6725), obtained with a
0.25-m f/4.1 reflector (+ CCD) on Aug. 29.444 UT:  R.A. =
19h18m20s.82, Decl. = -60o29'42".0 (equinox 2000.0); this
corresponds to an offset 14".2 west and 20".7 north of the center
of NGC 6769.  The estimated magnitude of the supernova was 17.5.


COMET C/1997 O1 (TILBROOK)
     Visual m_1 estimates:  Aug. 4.4 UT, 11.0: (F. Farrell,
Christies Beach, S. Australia, 0.15-m reflector); 7.38, 10.3 (J.
Seach, Mclean, N.S.W., 0.25-m reflector); 7.88, 11.1: (J. Carvajal,
Avila, Spain, 0.44-m reflector); 21.41, 11.0 (D. A. J. Seargent,
Cowra, N.S.W., 25x100 binoculars).

                      (C) Copyright 1997 CBAT
1997 August 29                 (6728)            Daniel W. E. Green

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