bgp history lookup tool?

[mike-nanog at tiedyenetworks.com (Mike)]

Hi,

I am trying to diagnose an event yesterday where our provider appears to 
have dropped our routes and we were inaccessible from outside our 
provider. I thought somewhere someone was keeping a searchable database 
of bgp announce/withdrawals and it would be useful to have a peek and 
see if any such event concerning our prefix/as was seen anywhere.

Mike-