The HEGRA Collaboration thanks the Instituto de Astrofí sica de Canarias for the use of the HEGRA site at the Roque de los Muchachos and its facilities. We also thank the BATSE, ULYSSES and WATCH teams for the availability of their data. We are especially grateful to A. J. Castro-Tirado, J. Gorosabel, K. Hurley, M. Kippen and S. Y. Sazonov. This work was supported by the BMBF, the DFG, the CICYT and a grant from the MEC.
© European Southern Observatory (ESO) 1998
Online publication: August 6, 1998