We thank the Instituto de Astrofísica de Canarias (IAC) for supplying excellent working conditions at La Palma. We gratefully acknowledge the work of the technical support staff of Heidelberg, Kiel, Munich and Yerevan. HEGRA is supported by the BMBF (Germany) and CYCIT (Spain). The correlation analysis of the TeV flux and the RXTE ASM X-ray flux has used data obtained through the High Energy Astrophysics Science Archive Research Center Online Service, provided by the NASA/Goddard Space Flight Center.
© European Southern Observatory (ESO) 1999
Online publication: December 22, 1998