Periodicities in X-ray binaries from swift/BAT observations

Robin Corbet*, Craig Markwardt, Louis Barbier, Scott Barthelmy, Jay Cummings, Neil Gehrels, Hans Krimm, David Palmer, Takanori Sakamoto, Goro Sato, Jack Tueller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The Burst Alert Telescope (BAT) on board Swift has accumulated extensive light curves for 265 sources (not including GRBs) in the energy range 14 to 200 keV. We present here a summary of searches for periodic modulation in the flux from X-ray binaries. Our results include: determination of the orbital periods of IGR J16418-4532 and IGR J16320-4751; the disappearance of a previously known 9.6 day period in 4U 2206+54; the detection of a 5 hour period in the symbiotic X-ray binary 4U 1954+31, which might be the slowest neutron star rotation period yet discovered; and the detection of flares in the supergiant system IE 1145.1-6141 which occur at both periastron and apastron passage with nearly equal amplitude. We compare techniques of weighting data points in power spectra and present a method related to the semi-weighted mean which, unlike conventional weighting, works well over a wide range of source brightness.

Original languageEnglish
Pages (from-to)200-203
Number of pages4
JournalProgress of Theoretical Physics Supplement
Issue number169
Publication statusPublished - 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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