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IAUC 5641: gamma-RAY BURSTS; 1991a1

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                                                  Circular No. 5641
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


gamma-RAY BURSTS
     C. A. Meegan, G. J. Fishman, R. B. Wilson, W. S. Paciesas, M.
N. Brock, J. M. Horack, G. N. Pendleton, and C. Kouveliotou report
for the BATSE Science Team:  "The BATSE experiment on the Compton
Gamma Ray Observatory has detected 447 cosmic gamma-ray bursts from
1991 Apr. 24 through 1992 Oct. 7.  An improved algorithm for
computing the directions to the bursts has been developed, which
reduces systematic errors to about 2 deg (versus about 6 deg
previously). So far, a total of 238 burst locations have been recomputed
with the new algorithm.  The distribution of 447 located events
is isotropic within the statistical limits, as we have reported
previously (IAUC 5358; Nature 355, 143; IAUC 5478).  A measure of
the dipole moment with respect to the Galactic Center is <cos
theta> = 0.034 +/- 0.027 (versus -0.014 for an isotropic distribution,
including the effect of non-uniform sky coverage).  A measure
of the quadrupole moment with respect to the Galactic Plane is
<sinE2 b> = 0.316 +/- 0.014 (versus 0.329 for an isotropic distribution,
including the effect on non-uniform sky coverage).  V/Vmax
is 0.324 +/- 0.016.  The first BATSE burst catalogue will be made
publicly available through the GRO Science Support Center within
the next few weeks.  It will contain bursts detected between launch
in 1991 April and 1992 Mar. 5.  The catalogue may be accessed via
SPAN (SET HOST GROSSC) or Telnet (grossc.gsfc.nasa.gov); the
username is 'gronews'."


COMET SHOEMAKER-LEVY (1991a1)
     Ephemeris from orbital elements on MPC 20602:

1992/93     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 15    12 22.26   -36 01.6   2.433   1.654   30.6   17.9   11.6
     25    12 23.46   -40 04.9   2.509   1.787   35.0   18.6   12.0
Nov.  4    12 23.52   -44 09.7   2.564   1.920   40.4   19.6   12.4
     14    12 21.76   -48 18.2   2.601   2.051   46.6   20.5   12.7
     24    12 17.20   -52 31.1   2.626   2.181   53.1   21.2   13.0
Dec.  4    12 08.37   -56 46.1   2.641   2.310   59.9   21.7   13.2
     14    11 53.11   -60 56.8   2.653   2.437   66.7   21.8   13.5
     24    11 28.36   -64 50.5   2.666   2.562   73.3   21.6   13.7
Jan.  3    10 50.47   -68 04.8   2.685   2.686   79.5   21.1   13.9
     13     9 58.1    -70 07.5   2.715   2.809   85.1   20.4   14.2


1992 October 21                (5641)            Daniel W. E. Green

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