_gat._getTracker("UA-VIRTUAL")

Every now and then I get:

var virtualTracker = _gat._getTracker("UA-VIRTUAL");

in my analytics code.

EG:

<script type="text/javascript"><!--
window.google_analytics_uacct = "UA-2****9-9";
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
//-->
</script>
<script type="text/javascript"><!--
try {
var virtualTracker = _gat._getTracker("UA-VIRTUAL");

virtualTracker._setVar("member");
var pageTracker = _gat._getTracker("UA-2****9-9");
pageTracker._trackPageview();

} catch(err) {}
//-->
</script>

not pinpointed if there is any patten in it showing yet. Will let you know if I do.

This is implemented to avoid affecting Bounce rate in reporting when registering "User defined visitors", which are segmented on members/guests automatically.