[vsnet-campaign-xray 145] IL Lup = 4U1543-47 bright outburst!

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

IL Lup = 4U1543-47 bright outburst!

From: Jon Miller <jmm@space.mit.edu>
Date: Mon, 17 Jun 2002 15:42:48 -0400 (EDT)

Subject: Bright Outburst of the Black Hole Candidate 4U 1543-47

X-ray outburst in 4U1543-47

        J. M. Miller and R. A. Remillard (M.I.T.), for the RXTE ASM Team
at M.I.T. and NASA Goddard Space Flight Center, report the detection
of a new X-ray outburst in the black hole binary, 4U1543-47 (archival
optical position: R.A. = 15h47m08.6s, Decl. = -47 40' 09", equinox
J2000.0; +/- 1 ").  The first detections with the RXTE ASM 
indicated a flux (2-12 keV) of 0.054 (+/- 0.009) Crab on June 16.683,
rapidly increasing to 0.5 Crab (June 17.122) and 1.65 Crab (June 17.552). 
The X-ray spectrum is very soft, implying that the dominant component 
is thermal emission from the accretion disk.  Optical and radio 
measurements are strongly encouraged.

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