Page is a not externally linkable
-- Google SEO News and Discussion
---- 6-week old site disappeared from SERPs around March 1
JesterMagic - 12:08 am on Mar 18, 2013 (gmt 0)Thread source:: http://www.webmasterworld.com/google/4555894.htm
You also need to consider that when Google finds new content and deems it news worthy that it will rank it higher for a week or so and then you will start to see it slide.
Brought to you by WebmasterWorld: http://www.webmasterworld.com