Sounds like most likely either a bad or misadjusted thermocouple. I'd also check to make sure that the burner orifice isn't obstructed. If the thermocouple doesn't work (defective) then it needs replacing. If it isn't properly adjusted to where it heats up, it will shut off the gas supply because it is sensing that the pilot isn't lit, (which, if lit, would heat up the thermocouple to keep the gas valve open.) It could possibly be a bad controller board, but chances are most likely, that it's a thermocouple problem. At least, this is where I'd begin troubleshooting, as this is the most common problem when it won't stay lit.
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