scholarly journals SIMULATING THE HIGH ENERGY GAMMA-RAY SKY SEEN BY THE GLAST LARGE AREA TELESCOPE

2006 ◽  
pp. 309-314
Author(s):  
F. LONGO ◽  
P. AZZI ◽  
D. BASTIERI ◽  
P. BUSETTO ◽  
Y. LEI ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Large Area ◽  
High Energy Gamma ◽  
Energy Gamma

scholarly journals THE VERY BRIGHT AND NEARBY GRB130427A: THE EXTRA HARD SPECTRAL COMPONENT AND IMPLICATIONS FOR VERY HIGH-ENERGY GAMMA-RAY OBSERVATIONS OF GAMMA-RAY BURSTS

2014 ◽  
Vol 28 ◽  
pp. 1460174
Author(s):  
PAK-HIN THOMAS TAM
Keyword(s):  
Gamma Ray ◽  
Spectral Component ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Prompt Gamma ◽  
Large Area ◽  
High Energy Gamma ◽  
Very High Energy ◽  
Energy Gamma ◽  
Very High

The extended high-energy gamma-ray (>100 MeV) emission occurring after the prompt gamma-ray bursts (GRBs) is usually characterized by a single power-law spectrum, which has been explained as the afterglow synchrotron radiation. We report on the Fermi Large Area Telescope (LAT) observations of the >100 MeV emission from the very bright and nearby GRB 130427A, up to ~100 GeV. By performing time-resolved spectral fits of GRB 130427A, we found a strong evidence of an extra hard spectral component above a few GeV that exists in the extended high-energy emission of this GRB. This extra spectral component may represent the first clear evidence of the long sought-after afterglow inverse Compton emission. Prospects for observations at the very high-energy gamma-rays, i.e., above 100 GeV, are described.

scholarly journals Development of large-area drift chambers for high-energy gamma-ray astrophysics

1994 ◽  
Author(s):  
Reshmi Mukherjee ◽  
D. L. Bertsch ◽  
Rajani Cuddapah ◽  
Brenda L. Dingus ◽  
Joseph A. Esposito ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Large Area ◽  
High Energy Gamma ◽  
Drift Chambers ◽  
Energy Gamma

scholarly journals A Large-Area Gas-Čerenkov Detector for High-Energy Gamma-Ray Astronomy

1971 ◽  
Vol 41 ◽  
pp. 75-76 ◽  
Author(s):  
J. Delvaille ◽  
K. Greisen ◽  
D. Koch ◽  
B. McBreen ◽  
G. Fazio ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Point Sources ◽  
Large Area ◽  
Cerenkov Detector ◽  
High Energy Gamma ◽  
Area 5 ◽  
Theoretical Predictions ◽  
Order Of Magnitude ◽  
Energy Gamma

Experimental upper limits of the high-energy gamma-ray flux (above 100 MeV) from point sources are about 10−5 cm−2 s−1, and realistic theoretical predictions for the strongest sources are an order of magnitude lower than this, while the diffuse background flux is about 4 × 10−5 cm−2 s−1 sr−1 in space, and 100 times higher at balloon altitudes. To meet the need for instrumental sensitivity and angular resolution adequate to measure the small but important gamma-ray source strengths, a telescope of large area (5 m2) and fine angular discrimination (0.5 deg at 300 MeV, 0.3 deg at energies above 1 GeV) has been developed.

Spectral curvature in high-energy gamma ray bursts observed by the BATSE large area detectors

1994 ◽  
Author(s):  
R. D. Preece ◽  
M. S. Briggs ◽  
W. S. Paciesas ◽  
G. N. Pendleton ◽  
C. Kouveliotou ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Large Area ◽  
High Energy Gamma ◽  
Energy Gamma

scholarly journals Investigating the region of 3C 397 in High Energy Gamma rays

2017 ◽  
Vol 12 (S331) ◽  
pp. 316-319
Author(s):  
Pooja Bhattacharjee ◽  
Pratik Majumdar ◽  
Tulun Ergin ◽  
Lab Saha ◽  
Partha S. Joarder
Keyword(s):  
Gamma Rays ◽  
Supernova Remnant ◽  
Gamma Ray ◽  
High Energy ◽  
Large Area ◽  
High Energy Gamma ◽  
Excess Emission ◽  
Energy Gamma ◽  
Pulse Analysis ◽  
Radio Location

AbstractWe investigate the supernova remnant (SNR) 3C 397 and its neighboring pulsar PSR J1906+0722 in high energy gamma rays by using nearly six years of archival data of Large Area Telescope on board Fermi Gamma Ray Space Telescope (Fermi-LAT). The off-pulse analysis of gamma-ray flux from the location of PSR J1906+0722 reveals an excess emission which is found to be very close to the radio location of 3C 397. Here, we present the preliminary results of this gamma-ray analysis of 3C 397 and PSR J1906+0722.

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