Does Heroku add cookies to my hosted web app?

I'm seeing cookies on several of my Heroku hosted web apps.

Why are they there? Do you see them too?

> document.cookie

"__qca=P0-655933652-1360396453625; __utma=164893738.812724335.1360396454.1360402233.1360424700.3; __utmc=164893738; __utmz=164893738.1360396454.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none);"