Nikkei bounces, geopolitical concerns restrain buyers

* Nikkei rises 0.5 pct, Topix up 0.5 pct * Geopolitical woes keep investors sidelined * Mitsui Fudosan up on strong investor demand for its share offer * Shippers down after Baltic Index drops to 1-year low By Tomo Uetake TOKYO, June 17 (Reuters) - Japanese stocks rebounded from steep falls on the previous day, but Tuesday's early session saw most institutions holding back on growing concerns over geopolitical risks in the Middle East and Ukraine. The benchmark Nikkei ga