Raga Bhairav belongs to Bhairav Thaat. It is an early morning Raga, using all seven notes in the ascent and in the descent. Rishabh and Dhaivat are komal (flat) and the other notes are shuddha (full). The derivative ragas out of this structure are grouped under the broad head of Bhairav Thaat.
Thaat : Bhairav
Samay : Early Morning