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ATEL # 2092; R.H.D. Corbet (UMBC/NASA GSFC), A.J. Bird, M.J. Coe, V.A. McBride, L.J. Townsend (Southampton), F.E. Marshall (NASA GSFC)
on 22 Jun 2009; 13:21 UT
Password Certification: Robin Corbet (Robin.Corbet@nasa.gov)
Subjects: X-ray, Binaries, Neutron Stars, Pulsars, Transients, Variables, Stars
The location of IGR J01054-7253 (ATEL #2079) was observed with the Rossi X-ray Timing Explorer Proportional Counter Array on 2009-06-19 with an exposure time of 8ks. The power spectrum of the light curve shows pulsations at a period of 11.483 +/- 0.002 s. Several harmonics of the 11.48s period are seen and the pulse profile is complex with multiple peaks. No pulsations are seen at the period of 17.49s in the Swift XRT observations reported in ATEL #2088. The 17.49s Swift period can now be understood as arising from an alias between the 11.48s period and the length of the four separate Swift data blocks.
We note that although the 11.48s period is similar to the 11.6s pulse period of IGR J015712-7259 (Coe et al. 2008, ATEL #1882), the two sources are separated by 3.8 degrees. IGR J015712-7259 hence lies well outside the 2 degree FWZI PCA field of view in our observations.