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                                                  Circular No. 3681
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758

     H. C. Arp and J. W. Sulentic report the discovery at Palomar
Observatory of a supernova in the binary system NGC 5679A,B = Arp
274.  The object was of magnitude V = 18.0 +/- 0.5 on Mar. 23 and
situated on the line connecting the qalaxies, 0'.3 west of NGC 5679B,
which is at R.A. = 14h32m.6, Decl. = +5o34' (equinox 1950.0).

     With reference to IAUC 3652, W. H. G. Lewin communicates the
following Hakacho observing schedule for 1982 Mar.-Aug.:

Now-Apr. 12: Cen X-3, GX 304-1, GX 301-2 (this source expected to
   go from low to high state near Apr. 8 +/- 3), Her X-1;
Apr. 13-30: Galactic center, Rapid Burster MXB1730-335, 4U/MXB
   1735-44, GX 1+4;
May 1-12: GX 304-1, GX 301-2;
May 14-25: GX 339-4, Cir X-1;
May 27-June 9: 4U/MXB1636-53 (there is some evidence from observations
   during the past three years that the time delay between optical
   and x-ray bursts varies; further simultaneous observations
   could perhaps establish this);
June 10-20: 4U/MXB1636-53, Her X-1;
June 21-30: 4U/MXB1636-53;
July 1-20: Galactic center, MXB1730-335, 4U/MXB1735-44, GX 5-1 (no
   optical counterpart known), GX 1+4;
July 21-Aug. 20: GX 17+2 (optical counterpart uncertain; see IAUC
   3620; x-ray bursts have been observed; see IAUC 3624, 3628).

On request, only one object (or more) in the above options could be
observed during the periods indicated; this schedule can also be
changed (if spacecraft constraints permit).  Observers should
contact Lewin at M.I.T. (see IAUC 3652) or the Hakucho Team (M. Oda),
Institute of Space and Astronautical Science, 4-6-1 Komaba, Meguro-Ku,
Tokyo 153, Japan (telephone Japan 03-467-1111, telex Japan
24550 SPACETKY J, cables SPACETKY TOKYO JAPAN).  The x-ray observations
are made for a total of ~ 5 hr per day.  The exact times (in
UT) of the x-ray observations will be available about two weeks
prior to the observations, and they will be telexed to observers
if requested.

1982 March 26                  (3681)              Brian G. Marsden

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