Salaam,
Go here,,
Here are he various translation..
Khalifa
When he reached it, he was called from the edge of the right side of the valley, in the blessed spot where the burning bush was located: "O Moses, this is Me. GOD; Lord of the universe.
Pickthall
And when he reached it, he was called from the right side of the valley in the blessed field, from the tree: O Moses! Lo! I, even I, am Allah, the Lord of the Worlds;
Shakir
And when he came to it, a voice was uttered from the right side of the valley in the blessed spot of the bush, saying: O Musa! surely I am Allah, the Lord of the worlds.
Sher Ali
And when he came to it, he was called by a voice from the right side of the Valley, in the blessed spot, out of the tree; `O Moses, Verily, I am ALLAH, the Lord of the worlds;
If i am reading it correct,first Prophet Moses as saw the fire and headed towards it..then heard a voice...the funny part is it ALL say's..."right side of the valley"..
So it may mean it did not come from the tree itself,or that even if the bush is burning..
Inshallah Allah knows best...
The link if it works
Quran Browser.org: Browse, Compare and Search through Quran translations of Dr. Rashad Khalifa, Abdullah Yusuf Ali, Muhammad Marmaduke Pickthall, Maulvi Sher Ali and the Arabic Quran text