During this past week some of the burial records for the City of Belfast have gone online. Not all records are available at this time, however the records of over 360,000 burials are included. Of the three cemeteries currently available the most useful from Jewish researchers will be the Belfast City Cemetery, which includes it's Jewish section. The records from this cemetery date back to 1869.
The database (http://www.belfastcity.gov.uk/burialrecords/search.asp) which is free to access is very easy to use. The database can be searched by both first and last name as well as year of burial. One of the nice features is that if a date is unknown, it can be searched by decade simply by just listing the first 3 numbers, such as 192 for any burial in the 1920's.
A simple search for the surname Rutenburg yielded the following results;