Detection of 11.48s Pulsations from the Direction of IGR J01054-7253 with RXTE
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
Credential Certification: Robin Corbet (Robin.Corbet@nasa.gov)
Subjects: X-ray, Binary, Neutron Star, Star, Transient, Variables, Pulsar
Referred to by ATel #: 2202
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.
