LOL. Why use one word when four will do?
crawler.ceptro.br
WIRE/1.0 (Linux;i686;Bot,Robot,Spider,Crawler)
robots.txt? NO
Actually, the Bot,Robot,Spider,Crawler is a new (or newly named) UA from "crawler.ceptro.br". The usual's been bare nekkid:
crawler.ceptro.br - - [10/Sep/2010:18:59:16 -0n00] "HEAD / HTTP/1.1" 403 0 "-" "-"