Exception object lifetime

I want to know how the exception object is created ? and why the handler function parameter can be a non-const reference?

For example:

class E{
    public:
    const  char * error;
    E(const char* arg):error(arg){
    cout << "Constructor of E(): ";}

    E(const E& m){
        cout << "Copy constructor E(E& m): " ;
       error=m.error;
    }
};



int main(){
try{
    throw E("Out of memory");

}
catch(E& e){cout << e.error;}

}

Output: Constructor of E(): Out of memory

so I have throw E("out of memory") and E("out of memory")is just a temporary object and no object has been created except E("out of memory") because no copy constructor has been invoked. so even though this E("out of memory") is just a temporary object, I have a handler that take a non-const reference.

Can you explain to me why this is possible?