OAuth Bearer Token Cookie Name

For ASP.Net sites, the ApplicationOAuthProvider uses 
context.Request.Context.Authentication.SignIn(cookiesIdentity); out-of-the-box to append a cookie in the response. By default the cookie name is .AspNet.Cookies. For forms authentication, it's simple to change the cookie name via web.config and I would like to know how this is done for the bearer token cookies.
Thanks!