$$f(s) = \frac{\Gamma(s)}{2^s-1}, \space (-1<Re(s)<0 : fundamental \space strip)$$
There exsists $\gamma$ that $0<Re(s)\le \gamma$, such that $f(s) = O({|s|}^{-p}), (p>1)$
That is, How to evaluate the rightmost $\gamma$ that $|{\frac{\Gamma(s)}{2^s-1}}||s|^p \le C$ ?