We report a timing analysis of the Be transient X-ray binary EXO 053109-6609.2 in outburst observed with BeppoSAX. The luminosity of the source is ~1.1 × 1037 ergs s-1, similar to that observed in the previous three outbursts. The source shows pulsations from 0.1 up to 60 keV. The pulsed fraction does not seem to decrease with the energy. The pulse profile is double peaked in the whole energy band. The barycentric pulse period is 13.67590 ± 0.00008 s at MJD 50,520.0. The average rate of period change during the ~2 days of BeppoSAX observation is (3.7 ± 0.5) × 10-9 s s-1. Comparison with ROSAT data allowed the determination of a secular spin-down sec ~(3.67 ± 0.05) × 10?11 s s-1, computed over an interval of 1960 days.
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机译：我们报告了使用BeppoSAX观测到的Be瞬态X射线二进制EXO 053109-6609.2的时间分析。光源的发光度约为1.1×1037 ergs s-1，与之前的三个爆发相似。源显示的脉动范围为0.1至60 keV。脉冲分数似乎并未随能量而降低。脉冲轮廓在整个能带中是双峰值的。 MJD 50,520.0时的重心脉冲周期为13.67590±0.00008 s。 BeppoSAX观测〜2天期间的平均周期变化率为（3.7±0.5）×10-9 s s-1。通过与ROSAT数据进行比较，可以确定在1960天的间隔内计算出的长期旋转秒sec〜（3.67±0.05）×10？11 s s-1。
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