My approach was much simpler. I collared the price about 10 minutes before the news was due. My prices were set based on Bollinger Bands. It so happened that movement to the downside had the price action around the lower line, so I put my
sell stop around 20 pips below the lower line and the
buy stop just above the middle line (
SMA(20)). Then I waited. When the news came and the price shot up, my buy order executed. At the 1st pause in upside action, I put a 15 point
trailing stop.
I snagged 46.5 pips in 10 minutes (counting the wait time).
If I were to propose a more formal method of setting the stop prices, I'd say 2.5 Standard
Deviations above and below the price just before the news on H1 chart. It's risky, due to stop hunting and spread widening shenanigans. The important thing is to not stay in the trade if your stop executes prematurely -- close it and replace your stop order further away. Often, the market does a false move before the news that can
trigger your stop in the wrong direction. Better to pay the spread than to get caught on the wrong side of the bounce!
MM