'Alien' / 'Prometheus' notification sound for mobile

What high pitched sound in the trailers?

In the [url=http://www.youtube.com/watch?v=bEVY_lonKf4]'Alien' trailer[/url], you first hear it at 0:48 seconds, and it is repeated. In the [url=http://www.youtube.com/watch?v=sftuxbvGwiU]'Prometheus' teaser trailer[/url], you hear it first at 0:31 seconds and more clearly at 0:53 seconds. You can also hear it in the full trailer and TV spots.

What an amazingly unerving sound for my co-workers to hear when I leave my phone in the back room at work.