A procedure with a Bayesan approach for calculating upper limits to
gravitational wave bursts from coincidence experiments with multiple detectors
is described.Comment: 10 pages, 2 figures, latex files using cernlik.cls (included). This
paper and related work are also available at
http://grwav3.roma1.infn.it/pia/papersweb.html Version number 2: text
unchanged. Modified two references, adding the hep number