* BTr fully awards 15 billion pesos ($271.39 million) offer
* BTr awards 5 billion pesos of 91-day T-bills at 5.874% avg yield vs previous rate of 5.891%
* BTr awards 5 billion pesos of 182-day T-bills at 5.991% avg yield vs previous rate of 6.109%
* BTr awards 5 billion pesos of 364-day T-bills at 6.028% avg yield vs previous rate of 6.211%
* Details are on the BTr's website
($1 = 55.27 Philippine pesos)
(Reporting by Enrico Dela Cruz)