1989-2010

1996-08

http://arxiv.org/abs/astro-ph/9608182

Cosmic-Ray Electrons and the Diffuse Gamma-Ray Spectrum

T.A. Porter and R.J. Protheroe

The galactic background radiation has been observed at X-ray energies by satellites such as OSSE and Ginga [70], and at MeV to GeV energies by COMPTEL, COS-B and EGRET. Beyond 400 GeV upper limits on the galactic background have been obtained by optical Cerenkov telescopes and air shower arrays but, at present, no connection exists between the energy ranges observed by satellite-borne and ground based detectors. The proposed next generation of gamma-ray satellites, such as GLAST [71] and GAMMA-400 [72], will rectify this situation. Both the GLAST and GAMMA-400 groups provide estimates of the sensitivity of their proposed instruments, and they should be able to improve by approximately two orders of magnitude the Whipple upper limits in ~1 year of operation. Improvements of this order would provide further constraints on the high energy diffuse gamma-ray spectrum, and hence the high energy interstellar electron spectrum.

[72] Fradkin M.I.et al.1995,Proc. 24th Int. Cosmic Ray Conf., Rome,3, 705.

1989-10

http://lss.fnal.gov/archive/1989/pub/Pub-89-214-A.pdf
M. Ted Ressell and M. S. Turner, The grand unified photon spectrum, Fermilab Astrophysics Center. 
"...For example, Dogiel, et al. [53] point out that there has never been an experiment to search for cosmic gamma rays in the energy range 4-400 GeV, despite the fact that this region is a potentially interesting one (e.g., dark-matter decays and annihilations in the halo)". 
[53] V.A. Dogiel, A.P. Kostin, L.V. Kurnosova, L.A. Razorenov, M.A. Rusakovich, N.P. Topchiev, and M.I. Fradkin, Proc. 20th Internat. Cosmic-Ray Conf. (Moscow) 2, 356 (1987)