Sandra Bullock's home intruder may have kept a diary about her

It may not have been a random act of misfortune when Sandra Bullock's home was broken into early Sunday morning.

The 39-year-old intruder, identified as Joshua Corbett, may have been obsessed with the Oscar-winning actress, law enforcement sources tell Today. Corbett, who was arrested on suspicion of burglary after rummaging through her personal belongings, might have even kept a diary devoted to Bullock.

The break-in came just hours after Bullock, whose security is considered among the best in Hollywood, celebrated her win at Saturday's Spike TV Guys' Choice Awards. Officers responded to the call of a prowler around 6:30 a.m.

At the time of the encounter, the actress was inside her home with 4-year-old son Louis.

"She is unharmed and is fine," her rep told PEOPLE at the time.