1. BandD. L. et al. 1992, inGamma-Ray Bursts, AIP Conference Proceedings 265, eds. W. S.Paciesas and G. J.Fishman (AIP: New York), p. 169.
2. Barat, C., Hurley, K., Niel M., Vedrenne, G., Mitrofanov, I. G., Estulin I. V., Zenchenko V. M., and Dolidze V. Sh. 1984,Ap. J. Lett.,286, L11.
3. Fishman, G. J.et al. 1989a, inProceedings of the Gamma Ray Observatory Science Workshop, ed. W. N. Johnson, p. 2?39.
4. Fishman, G. J.et al. 1989b, inProceedings of the Gamma Ray Observatory Science Workshop, ed. W. N. Johnson, p. 3?47.
5. HardingA. K. 1991,Physics Reports,206, 327.