Forensic Thaumaturgy (Su)

A Sleepless detective can cast detect magic at will as a spell-like ability (caster level equal to her class level). When using detect magic (or spells that function as detect magic, such as arcane sight), the detective treats recently ended magical effects as though they were one category stronger when determining how long a lingering aura remains, and by concentrating for an additional round can determine exactly how long the lingering aura has been there (effectively allowing the Sleepless detective to learn when the spell or magic item that caused the aura was cast or destroyed, respectively).