On the downside 177 is acting as short term support and any break below will drag the pair further down till 176.45/175.75.
The pair's short term resistance is around 177.85 and any indicative break above would extend gains till 178.75/179.50
Indicators (4 Hour chart)
(50) - Buy
(14) - Buy
Recommendation: Buy GBP/JPY around 177.50, SL 176.45, Targets 178.45/179.40.