As mentioned by Mr Parrikar , there is some Bilawal-ang present in this raag . Now , I finally also found a page that subsumes it officially under Bilawal thaat . Normally every raag-index puts it under Kalyan thaat , which is following tradition . However I feel more at ease it being labelled under Bilawal .

https://learnraga.com/ragas/gaud-sarang

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