How did Dumbledore know about Potters death?

[Julia]

No: HPFGUIDX 125037


I don't know if someone mention this theory before cause I can't 
find the right thread...
I think that since Dumbledore and the Potters were then in the Order 
they were in some way connected. So that when some of them die or is 
in a great danger the other know about it - or maybe just Dumbledore 
knows.
That's why he was able to send Hagrid there (probably he knew 
through the same system that Harry is still alive)to get baby from 
the ruins...
Just the thought, sorry if that idea's been already discussed

Julia