This question is related to integration where i need to create subtask in jira like As a system how to know when,how and from where account is created in salesforce
You can use Salesforce Outbound Messaging to send out data related to a record and and when its created. Go through the following doc to know more: http://www.salesforce.com/us/developer/docs/officetoolkit/Content/sforce_api_om_outboundmessaging.htm
http://www.salesforce.com/us/developer/docs/officetoolkit/Content/sforce_api_om_outboundmessaging.htm