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New X-ray Transient, XTE J1726-476

ATel #623; A. M. Levine (MIT), D. Lin (MIT), and R. A. Remillard (MIT), for the ASM team at MIT and NASA/GSFC
on 10 Oct 2005; 15:03 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Ron Remillard (rr@space.mit.edu)

Subjects: X-ray, Transient

Referred to by ATel #: 624, 625, 626, 628, 629, 631

Observations with the RXTE All-Sky Monitor reveal X-ray emission from a new transient at coordinates 261.585, -47.570 (degrees, J2000), with a position uncertainty of 0.07 degrees at 90% confidence. The source was first detected on 2005 October 4, with an average flux of 32 (4) mCrab at 2-12 keV. By 2005 October 6 the flux had increased to 83 (5). The ASM hardness ratios (5-12 keV to 3-5 keV and 3-5 keV to 1.5-3 keV) both indicate a very soft spectrum, suggesting a black-hole binary with a thermal-type spectrum. Observations at other wavelengths are needed as soon as possible.