Abstract:
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We have carried out a period analysis of 2-10  keV observations of the 26.5 d
radio periodic X-ray binary LSI+61303 retrieved from the quick-look results
database provided by the ASM/RXTE team.  After applying different period search
methods, we find evidence that X-ray outbursts in LSI+61303 are very likely to
recur with the same radio o utburst period.  Our best estimate of the LSI+61303
X-ray period is 26.7+/-0.2 d.  The folded X-ray light curve displays a
fractional change in flux by a factor of about 5 and its highest emission level
overlaps with the active state of the radio emission.