Use Of An Array Of Three Off-Axis Zone Plates For Large Field Of View Gamma Ray Imaging

1974 ◽  
Author(s):  
R. J. Jaszczak ◽  
F. E. Moore ◽  
F. R. Whitehead
Keyword(s):  
Gamma Ray ◽  
Field Of View ◽  
Large Field ◽  
Zone Plates ◽  
Gamma Ray Imaging

scholarly journals Mapping the Galactic Center Region with GRASP

1989 ◽  
Vol 136 ◽  
pp. 633-637
Author(s):  
Ph. Durouchoux ◽  
G. Bignami ◽  
A. Dean ◽  
N. Lund ◽  
B. McBreen ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Galactic Center ◽  
Field Of View ◽  
Large Field ◽  
Observational Period ◽  
High Quality ◽  
Gamma Ray Astronomy ◽  
Center Region ◽  
Spectral Imager ◽  
Operational Range

The GRASP mission (Gamma-ray Astronomy with Spectroscopy and Positioning) is currently under study as an ESA space astronomy mission to be launched in the mid 90's. GRASP is designed as a high quality spectral imager (E/ΔE ≈ 500 at 1 Mev) with positioning to the arc minute level within a large field of view (≈7°) which operates over a wide spectral range (30 Kev-100 Mev) with a 3σ sensitivity of typically 10 mcrab or better over the entire operational range within an observational period of ≈105 seconds. In this paper, we will mainly discuss the capability of the instrument with respect to the study of both point source and diffuse source measurements of the galactic center region.

scholarly journals First detection of the Crab Nebula at TeV energies with a Cherenkov telescope in a dual-mirror Schwarzschild-Couder configuration: the ASTRI-Horn telescope

2020 ◽  
Vol 634 ◽  
pp. A22 ◽  
Author(s):  
S. Lombardi ◽  
O. Catalano ◽  
S. Scuderi ◽  
L. A. Antonelli ◽  
G. Pareschi ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Crab Nebula ◽  
Statistical Significance ◽  
High Energy ◽  
Field Of View ◽  
Large Field ◽  
Mirror Reflection ◽  
Camera System ◽  
Cherenkov Telescope ◽  
The Crab Nebula

We report on the first detection of very high-energy gamma-ray emission from the Crab Nebula by a Cherenkov telescope in dual-mirror Schwarzschild-Couder (SC) configuration. This result has been achieved by means of the 4 m ASTRI-Horn telescope, operated on Mt. Etna, Italy, and developed in the context of the Cherenkov Telescope Array Observatory preparatory phase. The dual-mirror SC design is aplanatic and characterized by a small plate scale, which allows us to implement large cameras with a large field of view, with small-size pixel sensors and a high level of compactness. The curved focal plane of the ASTRI camera is covered by silicon photo-multipliers, managed by an unconventional front-end electronic system that is based on a customized peak-sensing detector mode. The system includes internal and external calibration systems, hardware and software for control and acquisition, and the complete data archiving and processing chain. These observations of the Crab Nebula were carried out in December 2018 during the telescope verification phase for a total observation time (after data selection) of 24.4 h, equally divided between on- and off-axis source exposure. The camera system was still under commission and its functionality was not yet completely exploited. Furthermore, due to recent eruptions of the Etna Volcano, the mirror reflection efficiency was reduced. Nevertheless, the observations led to the detection of the source with a statistical significance of 5.4σ above an energy threshold of ∼3 TeV. This result provides an important step toward the use of dual-mirror systems in Cherenkov gamma-ray astronomy. A pathfinder mini-array based on nine ASTRI-like telescopes with a large field-of-view is in the course of implementation.

Characteristics and Performance of the GAW Experiment for a Large Field of View Cerenkov Gamma-ray Telescope

2006 ◽  
Vol 6 (S1) ◽  
pp. 369-372 ◽  
Author(s):  
G Cusumano ◽  
G Agnetta ◽  
P Assis ◽  
B Biondo ◽  
P Brogueira ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Field Of View ◽  
Large Field ◽  
And Performance

scholarly journals Simulations of expected signal and background of gamma-ray sources by large field-of-view detectors aboard CubeSats

2021 ◽  
Vol 7 (02) ◽  
Author(s):  
Gábor Galgóczi ◽  
Jakub Řípa ◽  
Riccardo Campana ◽  
Norbert Werner ◽  
András Pál ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Field Of View ◽  
Large Field ◽  
Expected Signal

scholarly journals Onboard catalogue of known X-ray sources for SVOM/ECLAIRs

2020 ◽  
Vol 645 ◽  
pp. A18 ◽  
Author(s):  
N. Dagoneau ◽  
S. Schanne ◽  
J. Rodriguez ◽  
J.-L. Atteia ◽  
B. Cordier
Keyword(s):  
Energy Band ◽  
Gamma Ray ◽  
Background Level ◽  
High Energy ◽  
Low Noise ◽  
Field Of View ◽  
Large Field ◽  
Galactic Centre ◽  
Reconstruction Process ◽  
X Ray

The SVOM mission currently under development will carry various instruments, and in particular the coded-mask telescope ECLAIRs, with a large field of view of about 2 sr, operating in the 4–150 keV energy band. The main goal of ECLAIRs is to detect high-energy transients such as gamma-ray bursts. Its onboard trigger software will search for new hard X-ray sources appearing in the sky, as well as peculiar behaviour (e.g. strong outbursts) from known sources, in order to repoint the satellite to perform follow-up observations with its onboard narrow-field-of-view instruments. The presence of known X-ray sources must be disentangled from the appearance of new sources. This is done with the help of an onboard source catalogue, which we present in this paper. As an input we use catalogues of X-ray sources detected by Swift/BAT and MAXI/GSC and we study the influence of the sources on ECLAIRs’ background level and on the quality of the sky-image reconstruction process. We show that the influence of the sources depends on the pointing direction on the sky, on the energy band, and on the exposure time. In the Galactic centre, the contribution from known sources largely dominates the cosmic X-ray background, which is, on the contrary, the main background in sky regions lacking strong sources. We also demonstrate the need to clean the contributions of these sources in order to maintain a low noise level in the sky images and to maintain a low threshold for the detection of new sources without introducing false triggers. We briefly describe one of our cleaning methods and its challenges. Finally, we present the overall structure of the onboard catalogue and the way it will be used to perform the source cleaning and disentangle detections of new sources from outbursts of known sources.

STATUS AND PERSPECTIVES OF GLAST GAMMA RAY EXPERIMENT

2005 ◽  
Vol 20 (29) ◽  
pp. 7009-7011
Author(s):  
◽  
N. GIGLIETTO
Keyword(s):  
Active Galactic Nuclei ◽  
Supernova Remnants ◽  
Gamma Ray ◽  
Galactic Nuclei ◽  
High Energy ◽  
Field Of View ◽  
Current Status ◽  
Large Field ◽  
Diffuse Emission ◽  
Large Area

GLAST, the Gamma-ray Large Area Telescope, is a satellite-based experiment able to measure the cosmic gamma-ray flux in the energy range between 20 MeV and 300 GeV or above. The sensitivity is more than 30 times respect to EGRET and the good spatial and time resolution over a large field of view let us to cover a large variety of high energy phenomena. In particular GLAST will be able to study both diffuse emission and point-like gamma ray sources, including active galactic nuclei, gamma ray bursts, pulsars and supernova remnants. In addition, the potentialities of GLAST to explore rare or exotic phenomena like supersymmetric dark matter annihilations will be shown. The present knowledge of the science opportunities that the GLAST experiment can explore will be completed with the detector description and the current status of the experiment.

scholarly journals Analysis and Simulation of the Pi of the Sky Detector Response

10.14311/1484 ◽  
2011 ◽  
Vol 51 (6) ◽  
Author(s):  
L. W. Piotrowski ◽  
A. F. Zarnecki
Keyword(s):  
Gamma Ray ◽  
Variable Stars ◽  
Field Of View ◽  
Large Field ◽  
Detector Response ◽  
Light Sources ◽  
Careful Study ◽  
Point Spread ◽  
Spread Function ◽  
Optical Flashes

The Pi of the Sky project observes optical flashes of astronomical origin and other light sources variable on short timescales, down to tens of seconds. We search mainly for optical emissions of Gamma Ray Bursts, but also for variable stars, blazars, etc. Precise photometry with a very large field of view (20?×20?) requires a careful study and modelling of a point spread function (PSF), as presented in this paper.

Numerical analysis of shift error in X-ray phase contrast imaging for large field of view

2017 ◽  
Vol 34 (1) ◽  
pp. 8
Author(s):  
Jianheng Huang ◽  
Yaohu Lei ◽  
Xin Liu ◽  
Jinchuan Guo ◽  
Ji Li ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Phase Contrast ◽  
Field Of View ◽  
Phase Contrast Imaging ◽  
Large Field ◽  
Contrast Imaging ◽  
X Ray
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