15. If each asymptote of the hyperbola \((x+m)^{2}-\frac{(y+2 m)^{2}}{9}=1\) intersects the parabola \(y=x^{2}+1\) at two distinct points, then the range of the real number \(m\) is \(\qquad\).
15. $-\frac{5}{4}<m<\frac{1}{4}$