We are grateful to the UK Particle Physics and Astronomy Research Council for support of the project. The Mark 6 telescope was designed and constructed with the assistance of the staff of the Physics Department, University of Durham. The efforts of Mr. P. Cottle, Mrs. E.S. Hilton and Mr. K. Tindale are acknowledged with gratitude. This paper uses quick look results provided by the ASM/RXTE and BATSE teams. We would like to thank the referee, Professor Christo Raubenheimer, for helpful comments on the original manuscript.
© European Southern Observatory (ESO) 2000
Online publication: December 15, 2000