Abstract
The Gamma Ray Observatory (GRO) is currently planned for a launch from the space shuttle in 1990. After the long hiatus in high-energy gamma-ray astronomy since the end of the COS-B mission in 1982, the Soviet missions Granat and Gamma-1 and the NASA mission GRO will resume observations in the energy range from below 100 keV and extending to above 10 GeV. GRO will carry four instruments designed to cover this range of over five decades in photon energy. It is planned to perform a complete sky survey above 1 MeV in the first year of the GRO mission. Data from this survey will be used to study galactic and extragalactic sources of gamma radiation as well as the galactic and extragalactic diffuse emissions. Additionally, measurements of gamma ray bursts will be performed. The angular and spectral resolution of the GRO instruments is significantly improved with respect to previous experiments. The sensitivity for point sources will be better by an order of magnitude, and the location of strong, high energy sources will be determined to about 0.1°–0.2°. After a brief description of the complement of GRO instruments, a detailed discussion of the high-energy telescope EGRET, its design and scientific objectives, is presented in this review.
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Bignami, G. F., Fichtel, C. E., Kniffen, D. A., and Thompson, D. J.: 1975, Astrophys. J. 199, 54.
Bignami, G. F., Caraveo, P. A., Paul, J. A., Salotti, L., and Vigroux, L.: 1987, Astrophys. J. 319, 358.
Fichtel, C. E.: 1988, in M. Kafatos (ed.), Supermassive Black Holes, Cambridge University Press, Cambridge, p. 177.
Fichtel, C. E., Simpson, G. A., and Thompson, D. J.: 1978, Astrophys. J. 222, 833.
Fichtel, C. E., Thompson, D. J., and Lamb, R. C.: 1987, Astrophys. J. 319, 362.
Halpern, J. P. and Tytler, D.: 1988, Astrophys. J. (in press).
Hermsen, W., Bennett, K., Bloemen, J. B. G. M., Buccheri, R., Jansen, F. A., Mastichiadis, A., Mayer-Hasselwander, H. A., Özel, M. E., Pollock, A. M. T., and Strong, A. W.: 1987, Astron. Astrophys. 175, 141.
Houston, B. P., Riley, P. A., and Wolfendale A. W.: 1983, 18th Int. Cosmic Ray Conf., Bangalore 1, 89.
Hughes, E. B., Hofstadter, R., Johansson, A., Rolfe, J., Bertsch, D. L., Cruickshank, W. J., Ehrmann, C. H., Fichtel, C. E., Hartman, R. C., Kniffen, D. A., Ross, R. W., Thompson, D. J., Pinkau, K., Rothermel, H., Sommer, M., Mayer-Hasselwander, H., Favale, A., and Schneid, E.: 1980, IEEE Trans. Nucl. Sci. NS-27, 364.
Hughes, E. B., Finman, L. C., Hofstadter, R., Lepetich, J. E., Lin, Y. C., Mattox, J. R., Nolan, P. L., Parks, R., and Walker, A. H.: 1986, IEEE Trans. Nucl. Sci. NS-33, 728.
Kniffen, D., Kurfess, J., Schönfelder, V., Fichtel, C., Hofstadter, R., Pinkau, K., and Fishman, G.: 1988, The Gamma Ray Observatory Science Plan, prepared by GRO Science Working Team.
Kraushaar, W. L., Clark, G. W., Garmire, G. P., Borken, R., Higbie, P., Leong, V., and Thorsos, T.: 1972, Astrophys. J. 177, 341.
Lamb, R. C., Fichtel, C. E., Hartman, R. C., Kniffen, D. A., and Thompson, D. J.: 1977, Astrophys. J. 212, L63.
Mattox, J. R., Hofstadter, R., Hughes, E. B., Lin, Y. C., Nolan, P. L. and Walker, A. H.: 1987, Nucl. Instr. Meth. B24, 888.
Matz, S. M., Forrest, D. J., Vestrand, W. T., Chupp, E. L., Share, G. H., and Rieger, E.: 1985, Astrophys. J. 288, L35.
Özel, M. E. and Berkhuijsen E.M.: 1987, Astron. Astrophys. 172, 378.
Pollock, A. M. T., Bennett, K., Bignami, G. F., Bloemen, J. B. G. M., Buccheri, R., Caraveo, P., Hermsen, W., Kanbach, G., Lebrun, F., Mayer-Hasselwander, H. A., and Strong, A. W.: 1985a, Astron. Astrophys. 146, 352; 1985b, 19th Int. Cosmic Ray Conf., La Jolla 1, 338.
Simpson, G. and Mayer-Hasselwander, H. A.: 1987, 20th Int. Cosmic Ray Conf., Moscow 1, 89.
Stecker, F. W., Solomon, P. M., Scoville, N. W., and Ryter, C. E.: 1975, Astrophys. J. 201, 90.
Swanenburg, B. N., Bennett, K., Bignami, G. F., Buccheri, R., Caraveo, P., Hermsen, W., Kanbach, G., Lichti, G.G., Masnou, J.L., Mayer-Hasselwander, H. A., Paul, J. A., Sacco, B., Scarsi, L. and Wills, R. D.: 1981, Astrophys. J. 243, L69.
Strong, A. W., Bloemen, J. B. G. M., Dame, D. M., Grenier, I. A., Hermsen, W., Lebrun, F., Nyman, L.-A., Pollock, A. M. T., and Thaddeus, P.: 1987, 20th Int. Cosmic Ray Conf., Moscow 1, 125; 1988, Astron. Astrophys., in press.
Thompson, D. J.: 1986, Nucl Instr. Meth. A251, 390.
Thompson, D. J., Bertsch, D. L., Favale, A., Fichtel, C. E., Hartman, R. C., Hofstadter, R., Hughes, E. B., Hunter, S. D., Hughlock, B. W., Kanbach, G., Kniffen, D. A., Lin, Y. C., Mattox, J. R., Mayer-Hasselwander, H., Nolan, P. L., Pinkau, K., Rothermel, H., Schneid, E., Sommer, M., and Walker, A. H.: 1987, IEEE Trans. Nucl. Sci. NS-34, 36.
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Kanbach, G., Bertsch, D.L., Favale, A. et al. The project EGRET (energetic gamma-ray experiment telescope) on NASA's Gamma-Ray Observatory GRO. Space Sci Rev 49, 69–84 (1989). https://doi.org/10.1007/BF00173744
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DOI: https://doi.org/10.1007/BF00173744