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There are two bots: Deep Crawl and Fast Crawl. Both of them are collectively called "Googlebot". Fast Crawl is also known as "Freshbot" as it quickly skims your site for new content and leaves the real work for Deep Crawl.
However, now that Brett seems to use Googlebot and Freshbot as separate bots, I'm a bit confused. So here's my new overview:
There are two bots: Deep Crawl and Fast Crawl. Fast Crawl is also known as "Freshbot" as it quickly skims your site for new content and leaves the real work for Deep Crawl. Deep Crawl is also known as the one and only Googlebot (it's considered the "real" bot of Google since it does the hard work).
Right?
216.239.46.*
Freshbot is what tries to keep the index more up-to-date between monthly updates. It only hits some pages and sites, its effects can be temporary, and it's not always running. Freshbot-updated listings will show a date between the file size and "Cached" link in the search results. Freshbot typically has an IP around -
64.68.82.*
P.S. - both the deep crawler and Freshbot will show up as "Googlebot" in your logs, you need to look at the IP address to see which one it is.
Side note on the bots. Does Deep crawl typically occur in between updates or closer to the actual update i.e, a week before, days before, etc.