  In 2003 a previously unpulsed Einstein and ROSAT source cataloged as soft and
dim (Lx of few 10^33 ergs) thermal emitting object, namely XTE J1810-197, was
identified as the first unambiguous transient Anomalous X-ray Pulsar. Two years
later this source was also found to be a bright highly polarized transient
radio pulsar, a unique property among both AXPs and radio pulsars. In September
2006 the Swift Burst Alert Telescope (BAT) detected an intense burst from the
candidate AXP CXOU J164710.2-455216, which entered in an outburst state
reaching a peak emission of at least a factor of 300 higher than quiescence.
Here, we briefly outline the recent results concerning the outburst phenomena
observed in these two AXPs. In particular, XTE J1810-197 has probed to be a
unique laboratory to monitor the timing and spectral properties of a
cooling/fading AXP, while new important information have been inferred from
X-ray and radio band simultaneous observations. CXOU J164710.2-455216 has been
monitored in X-rays and radio bands since the very beginning of its outbursting
state allowing us to cover the first phases of the outburst and to study the
timing and spectral behavior during the first months.
