Passengers in 1887 ie OLSEN

I recently found my great grandfathers application for citizenship to the US and his Certificate of Citizenship. All I know at this time is that he arrived in the US in and about August 1887 with his brother. I don't know about any other family menmbers. His Name is Hjalmer James OLSEN and his brother from what I have been told is Called Bill or William OLSEN. Can Someone please help me locate any information on eather of them. Thank you, Tim