EDIT: no more mentioning of this bird in the "Schiphol-thread", so presumably gone...
http://forum.scramble.nl/viewtopic.php?p=466816#p466816 shows Gulfstream N1 at Schiphol-East last Monday evening. Arrived at 21.30 hrs local time.
Departure time/date not (yet) known.
Yes, this is very much a government aircraft! Owned by the Federal Aviation Administration, one of the few remaining US gov VIP Gulfstreams in distinctive colours...