Bypass node access with Panels
To overrider the default Access Denied page of the Drupal, you have to change the path of this page.

To change the page path, follow these steps:


Go to admin/config/system/site-information.
At the bottom of the page, there is a Error Pages section.
There is a field Default 403 (access denied) page. Provide your custom panel page link.
And the save it. 


I hope it will work.