around MJD 51600. For this reason the pulse amplitudes plotted in Figure \[fig:smcx2amp\] are derived either from the fundamental or harmonic depending on which was the stronger.

The X-ray spectrum of SMC X-2 was extracted for 3 observations, the two targeted pointings [@Corbet01_x2] and observation 5 when the highest flux was observed. Assuming the spectral parameters in Table \[tab:x2spec\] to be reasonably representative of SMC X-2 during the whole outburst ($N_H=2\times10^{22}$ cm$^{-2}$, $\alpha=1$) the fluxes reported in Table \[tab:x2flux\] may be converted to $L_X$ by $1{\hbox{${{\rm\thinspace counts}}{{\rm\thinspace PCU}}^{-1}{{\rm\thinspace s}}^{-1}\,$}}= 1.72\times10^{37}{\mbox{${{\rm\thinspace erg}}{{\rm\thinspace s}}^{-1}$}}$ assuming a 65 kpc distance to the SMC.

### In-outburst Timing Behavior

Period variations evident in Figure \[fig:smcx2amp\] are suggestive of spin-up or orbital modulation, these measurements were investigated and refined by Phase Dispersion Minimization (PDM). The PDM method was used because the shape of the pulse profiles are highly irregular and change between observations. A period range was selected that encompasses all the periods determined from the power spectra, hence a range of 2.371-2.373s at a resolution of 10$^{-6}$ s rather than the fundamental. These periods are given in Table \[tab:x2flux\]. The magnitude of the variations is 1.7$\times10^{-3}$ s, significantly larger than the mean uncertainty (3.9$\times10^{-5}$ s) 