Those messages are produced by mIRC, not by the server, and so do not have raws. mIRC keeps track of who is online from your notify list using /ison or /watch if it is supported by the server.
$notify(0) returns how many people are on your notify list. $notify(N).ison returns $true if the Nth person in your notify list is online, $false if he isn't and null if there isn't an Nth entry.
They are not related to mIRC's notify list, just as Collective said, but these are the events that you can use to run scripts that customise the events.