Long-Term Timing and Emission Behavior of the Young Crab-Like Pulsar PSR B0540–69

We present timing solutions and spin properties of the young pulsar PSR B0540-69 from analysis of 15.8 years of data from the Rossi X-Ray Timing Explorer. We perform a partially phase-coherent timing analysis in order to mitigate the pronounced effects of timing noise in this pulsar. We also perform fully coherent timing over large subsets of the data set in order to arrive at a more precise solution. In addition to the previously reported first glitch undergone by this pulsar, we find a second glitch, which occurred at MJD 52927 4, with fractional changes in spin frequency / = (1.64 0.05) 10 -9 and spin-down rate n n D =