how to go to non-gwt page from gwt app

i have gwt app that if the user fail the authentication, it kick the
user out to login page, which is a non-gwt page, what the function
that i can use to do the redirection on the client side?

here is my code:

userService.getCurrentUser(new AsyncCallback<User>() {
public void onFailure(Throwable exception) {
Window.alert(exception.getMessage());
GWT.log("getCurrentUser failed", exception);

//go to home.html, how?
}

public void onSuccess(User result) {
m_eventBus.fireEvent(new LoginEvent(result));
}
});

Thanks!

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