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ATEL # 1853; R. A. Remillard and A. M. Levine (MIT), for the RXTE All Sky Monitor team at MIT and NASA/GSFC
on 24 Nov 2008; 20:38 UT
Password Certification: Ron Remillard (email@example.com)
Subjects: X-ray, Transients
We have processed RXTE ASM data to construct the mission light curve for IGR J17062-6143 (ATel #1840), using the Swift XRT position. We first excluded camera dwells with a high background rate, filtering out dwells with channel A X-ray background < 12.0 ASM c/s. We then binned the flux measurements to intervals of one week. The resulting light curve shows that the source is a long-term, faint transient, and the current outburst began in late 2005 or early 2006. Between MJD 50088 (first observation) and 53600, the source is not detected. The weighted average flux is 1.3 (1.0) mCrab at 1.5-12 keV, with an uncertainty set by the systematic limit for ASM observations of faint sources. The source is weakly detected at 3.1 (1.0) mCrab during 53600 to 53800, rising to 5.1 (1.0) mCrab between 53800 and 54540, and 6.3 (1.0) mCrab between 54540 and the present day (54794). In the most recent interval, the X-ray color, HR2 = 1.3 (0.3), suggests a soft X-ray transient rather than a classical accretion-powered pulsar (see Cackett, Wijnands, and Remillard, 2006, MNRAS, 369, 1965).