Properties of a Large NaI(Tl) Spectrometer for the Energy Measurement of High-Energy Gamma Rays on the Gamma Ray Observatory

Hughes, E. B.; Finman, L. Campbell; Hofstadter, R.; Lepetich, J. E.; Lin, Y. C.; Mattox, J. R.; Nolan, P. L.; Parks, R. D.; Walker, A. H.

doi:10.1109/tns.1986.4337202

Cited by 2 publications

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“…These estimates were borne out by measurements performed with the TASC subsystem in a positron beam at SLAC (Hughes et aL, 1986). Table II summarizes the parameters of the EGRET telescope as they are expected on the basis of calculations and preliminary measurements.…”

Section: Angular and Energy Resolutionmentioning

confidence: 99%

The project EGRET (energetic gamma-ray experiment telescope) on NASA's Gamma-Ray Observatory GRO

et al. 1989

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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 ~ ~ 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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Section: Angular and Energy Resolutionmentioning

confidence: 99%

The project EGRET (energetic gamma-ray experiment telescope) on NASA's Gamma-Ray Observatory GRO

et al. 1989

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In‐Flight Calibration of EGRET on the Compton Gamma‐Ray Observatory

Esposito

Bertsch

Chen

et al. 1999

ASTROPHYS J SUPPL S

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The Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma-Ray Observatory has been operating for over 7 yr since its launch in 1991 April. This span of time far exceeds the design lifetime of 2 yr. As the instrument has aged, several changes have occurred owing to spark chamber gas exchanges as well as some hardware degradation and failures, all of which have an inÑuence on the instrument sensitivity. This paper describes postlaunch measurements and analysis that are done to calibrate the instrument response functions. The updated instrument characteristics are incorporated into the analysis software.

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Properties of a Large NaI(Tl) Spectrometer for the Energy Measurement of High-Energy Gamma Rays on the Gamma Ray Observatory

Cited by 2 publications

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The project EGRET (energetic gamma-ray experiment telescope) on NASA's Gamma-Ray Observatory GRO

The project EGRET (energetic gamma-ray experiment telescope) on NASA's Gamma-Ray Observatory GRO

In‐Flight Calibration of EGRET on the Compton Gamma‐Ray Observatory

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