[vsnet-alert 2154] new XTE transient

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

As reported in IAUC 7008, sent yesterday,

XTE J1550-564
     D. A. Smith, Massachusetts Institute of Technology (MIT), on
behalf of the RXTE/ASM teams at MIT and Goddard Space Flight Center
(GSFC), reports:  "A transient x-ray source has been detected with
the RXTE/ASM near R.A. = 15h50m41s, Decl. = -56o27'.6 (equinox
2000.0).  The source was first detected at an intensity of about 70
mCrab (2-12 keV; 5-sigma significance) in an observation at Sept.
7.0927 UT.  At Sept. 7.4282, the source was observed to have a
strength of 170 +/- 20 mCrab.  Crossed lines of position were
obtained; from these, the source is estimated to be located within
a region (90-percent confidence) defined by a box of width 4'.3 and
length 11'.0 with corners at R.A. = 15h51m31s, -56o33'.4; 15h50m19s,
-56o26'.1; 15h49m52s, -56o19'.3; 15h50m57s, -56o25'.1."
 
____

The flux is near 1 Crab as of 12 UT Sept. 9.

Optical and Radio identification would be very important.
The X-ray characteristics indicate a high-luminosity,
black-hole type X-ray transient.

-Ron Remillard
(rr@space.mit.edu)

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