http://premon.fbk.eu/resource/vn33-discover-84-1_frame_3 an entity of type: VerbNetFrame

8.1 
NP V PP.source how S_INF 
PP-HOW-TO-INF; from-PP 
discover(during(E), Agent, Theme, Source) 
Agent V {from} Source Theme [+wh_inf] 
0.1 

data from the linked data cloud