Help deleting Release based on bogus branch

Hi,
For my project: Global Region

I mistakenly created the branch 6.x-6.x(instead of 6.x-1.x) and created this release node for it: global_region 6.x-6.x-dev.

Can you please delete that release node? I also tried to delete the branch but was not able to.
Message from git:

The branch '6.x-6.x' is identified as an official development branch on Drupal.org, and therefore cannot be deleted.

Is it possible to delete the branch?

Thanks for your help

tedbow