The MACRO experiment has been running as a supernova neutrino detector
since 1989 and is sensitive to the whole galaxy since the beginning o
f 1992. A galactic supernova would produce some hundreds of <(nu)over
bar (e)> events in the detector, We describe our stellar gravitational
collapse online monitors and alarm system, and present the results of
a search for neutrino bursts from supernovae during a period of 1.5 y
r. (C) 1998 Elsevier Science B.V.