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The Orbital Period of IGR J11435-6109

ATel #377; R. H.D. Corbet (NASA/GSFC and USRA) and R. Remillard (MIT)
on 5 Jan 2005; 16:43 UT
Credential Certification: Robin Corbet (corbet@gsfc.nasa.gov)

Subjects: X-ray, Binary, Neutron Star, Transient, Pulsar

Referred to by ATel #: 531, 1239, 8414

The power spectrum of the Rossi X-ray Timing Explorer All Sky Monitor light curve of IGR J11435-6109 (ATEL #350, #358, #359, #362) obtained between 1996 January 5 and 2004 December 30 shows significant modulation at a period of 52.5 days. This confirms the orbital period proposed by in 't Zand & Heise (2004, ATEL #362). The mean flux measured with the ASM during this interval is 0.19 +/- 0.01 counts/s (2 - 12 keV), equivalent to 2.7 mCrab, and the Fourier amplitude of the modulation is 0.09 +/- 0.01 counts/s. A sine wave fit to the ASM light curve gives parameters of: period = 52.46 +/- 0.06 days and epoch of maximum flux = MJD 53069.5 +/- 1.9