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The millisecond pulsar PSR J1740-5340 in the globular cluster NGC 6397 showsradio eclipses over ~40% of its binary orbit. A first Chandra observationrevealed indications for the X-ray flux being orbit dependent as well. In thiswork we analysed five data sets of archival Chandra data taken between 2000 and2007 in order to investigate the emission across the pulsar's binary orbit.Utilizing archival Chandra observations of PSR J1740-5340, we have performed asystematic timing and spectral analysis of this binary system. Using achi-square-test the significance for intra-binary orbital modulation is foundto be between 88.5% and 99.6%, depending on the number of phase bins used toconstruct the light curve. Applying the unbiased statistical Kolmogorov-Smirnov(KS) test did not indicate any significant intra-binary orbital modulation,though. However, comparing the counting rates observed at different epochs aflux variability on times scales of days to years is indicated. The possibleorigin of the X-ray emission is discussed in a number of different scenarios.

X-rays from the Eclipsing Millisecond Pulsar PSR J1740-5340 in the Globular Cluster NGC 6397