Prompt study of AXP outbursts with XMM

The discovery of transient AXPs has has opened a new perspective in the fieldconfirming that a relatively large number of members of this class has not beendiscovered yet, and suggesting that others would manifest themself in the futurethrough outbursts. This proposal is aimed at gathering new insights on thephysics of AXPs through the study of the very initial phases (within 1015days)of their outbursts.