[Bhaagvat Puraan, 9/12]
Paanchaal were Chandra Vanshee. Their ancestors came from --
Pururavaa  ->  Aayu  -> Nahush  ->  Yayaati  ->  Puru  -> -> 
      Dushyant -> Bharat -> Bharadwaaj  -> ->  
          Hastee -> Ajameedh -> Neel -> Bharmyaashwa - 

Bharmyaashwa had 5 sons - Mudgal, Yaveenar, Brihdishu, Kaampilya and Sanjaya. 
          These 5 sons were called Paanchaal.
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Mudgal had a son Divodaas and a daughter Ahalyaa whom he married to Gautam Rishi - 
Gautam and Ahalyaa had the son Shataanand
Shataanand's son was Satyadhriti
Satyadhriti's son was Sharadwaan
Sharadwaan had a son named Krip and a daughter Kripee (Married to Drone) from an Apsaraa

Kripaa and Drone had the son named Ashwatthaamaa who remained unmarried

Thus Shataanand, Saradwaan, Kripaachaarya, Ashwatthaamaa etc were Gautam Rishi's descendents