Sometimes a page on our site will show up in the Google SERPs that was previously not indexed (yet) due to a news story or blog posting on another site that points to it.
From what I understand, the Google FreshBot has crawled it. The FreshBot's job is to find information that is current or newsworthy to the time and get it indexed and into the SERPs quickly.
However, the pages that benefit from that drop out of the SERPs after two or three days. As a matter of fact, if I do an advanced query and request that page specifically from our site (using "site:"), it appears to not even be indexed any more.
What's happening to our Google FreshBot crawled pages?
Do pages that are indexed by the FreshBot still need to be re-indexed by the DeepBot?
For what it's worth, we're ordinarily getting indexed daily at a healthy rate, but we don't yet have all of our pages indexed (large site). It has been encouraging to see the effect of the FreshBot indexing, but watching it fade away is hard to understand. On our pages indexed as part of our normal crawls, our SERPs are strong -- without the added relevancy of news or other off-page links.