They will show up in iTunes Connect automatically if the users have enabled that.
When the user synchronizes their device using iTunes, crash reports
are copied to a directory on the user's computer. If the application
was distributed via the App Store and the user has chosen to submit
crash logs to Apple, the crash log will be uploaded and the developer
can download it via iTunes Connect.
See: http://developer.apple.com/library/ios/#technotes/tn2008/tn2151.html
