* BTr fully awards 15 billion pesos ($276.70 million) offer
* BTr awards 5 billion pesos of 91-day T-bills at 4.186% avg
yield vs previous rate 4.152%
* BTr awards 5 billion pesos of 182-day T-bills at 4.867%
avg yield vs previous rate 4.875%
* BTr awards 5 billion pesos of 364-day T-bills at 5.292%
avg yield vs previous rate 5.354%
* Details are on the BTr's website
($1 = 54.2100 Philippine pesos) (Reporting by Enrico Dela Cruz)