[vsnet-alert 1086] new soft X-ray transient

[Ron Remillard <rr@space.mit.edu>]

New Soft X-ray Transient, XTEJ 1755-324

R. Remillard & A. Levine (MIT), J. Swank, and T. Strohmayer (GSFC)
for the RXTE ASM Team at MIT and GSFC.

        The All Sky Monitor of the Rossi X-ray Timing Explorer has 
detected a new X-ray source with a tentative position (J2000):
17h 55m 26s, -32 28.8' (uncertainty 0.1 degrees).
The source was first detected late on 1997 July 25 (UT).
By 1997 July 28 the flux had increased to 170 mCrab (2-12 keV).  
The X-ray spectrum is substantially steeper than that of the Crab nebula.
        The RXTE PCA conducted a brief observation early on 1997 July 29. 
PCA scans over the source refine the position to (J2000)
17h 55m 28.6s, -32 28' 39" (uncertainty 1').  The spectrum appears complex,
roughly consistent with a 0.7 keV disk black body combined with a 
hard component that extends above 10 keV. The flux is 2.9e-9 erg per square
cm per s at 2-20 keV.  The interstellar column density 
appears to be substantially less than 1.0e22 atoms per square cm.
        Optical and radio observations are strongly encouraged.

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