Nat Bhairav is a Hindustani classical Sampurna (heptatonic) raga of Bhairav Thaat. Traditionally it is a morning raga. It is one of the most important ragas of the Bhairav anga. In Western theory it is called the harmonic major scale.

Aaroh: Sa Re Ga Ma Pa Da[komal] Ni Sa
Avaroh: Sa Ni Da[komal] Pa Ma Ga Re Sa
That: Bhairav
Jaati: Sampoorna -Sampoorna
Vadi: Madhyam(Ma)
Samvadi: Shadj(Sa)
Samay: First Period of Day [6am to 9am]

Nat Bhairav also written as Nut Bhairav, नट भैरव