Le Coultre, P (reprint author), ETH, CH-8093 Zurich, Switzerland.
The data collected by the L3+C muon spectrometer at the CERN Large Electron-Positron collider, LEP, have been used to search for short duration signals emitted by cosmic point sources. A sky survey performed from July to November 1999 and from April to November 2000 has revealed one single flux enhancement (chance probability = 2.6 x 10(-3)) between the 17th and 20th of August 2000 from a direction with a galactic longitude of (265.02 +/- 0.42)degrees and latitude of (55.58 +/- 0.24)degrees. The energy of the detected muons was above 15 GeV. (C) 2009 Elsevier B.V. All rights reserved.