The state-run firm was seeking one cargo for October and two each in November and December.
Indian demand for gas has been rising after the government last year announced concessions for imports of the super cooled gas to boost power generation in the country.
GAIL has bought two cargoes for November from Shell and GAIL Global (Singapore) Pte Ltd - the trading subsidiary of the Indian firm, the sources said, adding that Qatar's Rasgas would supply the December cargo.
One of the sources said Rasgas had supplied the cargo on a delivered basis at a price close to $6 per mmBtu.
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