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IAUC 3154: SMC X-2 AND SMC X-3; X-RAY FLARE; III Zw 2; 1977 RA

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IAUC number 

                                                  Circular No. 3154
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758


SMC X-2 AND SMC X-3
     F. Li and G. Clark, Massachusetts Institute of Technology,
report that SMC X-2 and SMC X-3 (IAUC 3125) are highly variable.
Neither was detected during a continuous 8-day observation by SAS 3
of the SMC from Dec. 7 to 15.  The upper limit to their average x-ray
fluxes was ~ 2 x 10**-11 erg cm**-2 s**-1.


X-RAY FLARE
     M. Chartres and F. Li, Massachusetts Institute of Technology,
report the flare-up of an x-ray source located within an error circle
of radius 0o.5 centered at R.A. = 5h34m.6, Decl. = +26o.0 (equinox
1950.0).  The source, which is probably the recurrent transient
A0535+26 (Rosenberg et al. 1975, Nature 256, 628), was first
detected by SAS 3 on Dec. 20.5 UT and attained a flux equal to 0.5
Crab (2-10 keV) on Dec. 23.5.  Optical observations of the candidate
counterpart HD 245770 (Steier and Liller 1976, Astrophys. J.
206, 257) of A0535+26 are suggested.


III Zw 2
     H. W. Schnopper, Center for Astrophysics, and W. Cash, Space
Sciences Laboratory, University of California at Berkeley, report
the detection of x-ray emission from the type I Seyfert galaxy III
Zw 2, shown by Wright et al. to have had a recent radio outburst at
14.5 GHz (IAUC 3145).  X-rays were detected during 1977 Aug. with
the rmc on SAS 3, and the nucleus of the galaxy lies within a
90-percent-confidence circle of 1'.0 diameter.  The 2-10-keV x-ray flux
is 4.5 x 10**-11 erg cm**-2 s**-1, which corresponds to a luminosity of
1.5 x 10**45 erg s**-1.  Further x-ray, radio, optical and infrared
observations are urged.


1977 RA
     The following precise positions were obtained by A. Mrkos at
the Klet Observatory:

     1977 UT             R. A. (1950) Decl.        Mag.
     Oct. 16.83811    23 25 01.70   +15 42 35.3    15.8
          16.85241    23 25 02.53   +15 42 30.2


1977 December 27               (3154)              Brian G. Marsden

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