AIRWATCH/OWL: preliminary results from lab measurements and from balloon background observations Giarrusso, S. ; Catalano, O. ; Celi, F. ; La Rosa, G. ; Linsley, J. ; Maccarone, M. C. ; Sacco, B. ; Scarsi, L. Abstract Publication: Nuclear Physics B Proceedings Supplements Pub Date: January 2000 Bibcode: 2000NuPhS..80C0805G