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IAUC 6196: X-RAY N 1994 IN Sco; GRS 1915+105; Sats OF SATURN; 67P

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                                                  Circular No. 6196
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

     B. A. Harmon, M. L. McCollough, S. N. Zhang, W. S. Paciesas and
C. A. Wilson report, for the Compton Observatory/BATSE Team: "The
x-ray/radio transient GRO J1655-40 is undergoing a bright outburst
in hard x-rays above 20 keV.  The source became detectable around
July 22; its intensity exceeded 300 mCrab on July 27 and increased to 400
mCrab (+/- 10 percent) on July 29-30.  This is the brightest outburst in
hard x-rays since that of February-April (IAUC 6143, 6147).  The
spectrum on July 29-30 extends to at least 200 keV and is well fitted
by a power law with spectral index -2.4 +/- 0.1."

GRS 1915+105
     S. Sazonov and R. Sunyaev, on behalf of the GRANAT/WATCH Team,
report: "The x-ray transient GRS 1915+105 was found to be bright in the
observations of the GRANAT/WATCH all-sky monitor during July 19-25.
The average flux in the energy band 8-20 keV was 750 +/- 50 mCrab,
and no significant variations in intensity were found.  On July 27
the source became fainter, with flux 240 +/- 120 mCrab.  In the
previous set of WATCH observations, during June 9-16, the source was
not detected to an upper limit of 150 mCrab (2 sigma).

     With reference to the account on IAUC 6192, R. A. Jacobson,
Jet Propulsion Laboratory, notes that the calculated angular
distances from Saturn of Saturn XVIII (Pan), Saturn XV (Atlas) and
Saturn XVI (Prometheus) at the time of the May 22 HST observations were
-15".3, -18".9 and -19".3, respectively.  Since these ephemerides
could easily be in error at the arcsecond level, he suggests the
identity of S/1995 S 1 with Pan and that of S/1995 S 2 with either
Atlas or Prometheus.

     CCD total R magnitudes: July 3.41 UT, 17.1 (S. M. Larson and C. W.
Hergenrother, University of Arizona Catalina Station, 1.5-m reflector;
coma diameter 14"; 24" tail in p.a. 247 deg; 26.03, 17.3 (A. Galad,
Astronomical and Geophysical Observatory, Comenius University, Modra,
Slovakia, 0.6-m reflector); 27.05, 17.0 (Galad).

1995 August 1                  (6196)              Brian G. Marsden

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