Why does git cvsimport create a branch named origin?

["Steve Keller" <keller.steve@xxxxxx>]

After converting my CVS repositories from CVS to git using

    git cvsimport -a -m -A authors repo

I see that two branches, master and origin are created:

    $ cd repo
    $ git branch
    * master
      origin

What is the branch origin for?  Should I delete it?

Steve