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Burst Oscillations in the X-Ray Binary IGR J18245-2452 in M28

ATel #5068; A. Patruno (Univ. Amsterdam/ASTRON)
on 16 May 2013; 14:46 UT
Credential Certification: Alessandro Patruno (a.patruno@uva.nl)

Subjects: X-ray, Binary, Globular Cluster, Neutron Star

Referred to by ATel #: 5069, 5086

We report the detection of burst oscillations at a frequency of 254.4 Hz in the accreting neutron star IGR J18245-2452, recently discovered in the globular cluster M28 that went into outburst in April 2013 (Atel #4925, #4927, #4929, #4934). The burst oscillations are observed by the Swift/XRT telescope in Window-Timing mode, during a thermonuclear (type I) burst recorded on 2013-04-07 (Atel #4959, #4960). We detect the burst oscillations by averaging two consecutive power spectra of 32s length of the (not barycentered) burst tail light-curve. The single trial significance is 5.1 sigma.