4.
已知集合\(A=\left\{ \left. x \right|{{x}^{2}}-2x-3\leqslant 0 \right\},B=\left\{ \left. x \right|{{x}^{2}}-2mx+{{m}^{2}}-9\leqslant 0 \right\},m\in R\) .
\((1)\)若\(m=3,\)求\(A\bigcap B;\)
\((2)\)已知命题\(p:x\in A,\)命题\(q:x\in B,\)若\(q\)是\(p\)的必要条件,求实数\(m\)的取值范围.