Issue search - how to get issues which has been added in the Sprint?

[Teddy Tang]

Under the "Burndown Chart" option on the Agile Board reports, there are, under the Burndown graph, issues reported to be in the Sprint when the Sprint startet - in my case the "Date" column has the value 01/04/2014 10:07 which is exact when we startet the latest Sprint. The Event is "Sprint start". You can see a snippet here:

Further down we can see the event changed, like "Issue Completed" or "Issue added to the Sprint":

So my question is, how can I search the event "Issue added to the Sprint" and filter only those issues out in a query?

[Tim Lloyd]

I would also like a JQL query for this.  A quick way to count the # of story points added after a sprint has been started is very useful for checking how we are proceeding vs planned.