Signature alerts are transfered from the AIP-SSM module to your PC running IME and the alerts are achived in a local PC database. The events will persist in a circular buffer on the AIM-SSM module for a short peroid of time, untill they are overwritten. You can not configure the size of the AIP-SSM event store.
You can not send Syslogs for any alerts or events from the sensor. SNMP traps are spported, but you have to set that action on a signature by signature basis.