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24 April 2024

» arxiv » astro-ph/0301369

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STACEE Observations of Mrk 421 During the 2001 Flare
STACEE Collaboration ; L.M. Boone ; D. Bramel ; E. Chae ; C.E. Covault ; P. Fortin ; D.M. Gingrich ; D.S. Hanna ; J.A. Hinton ; R. Mukherjee ; C. Mueller ; R.A. Ong ; K. Ragan ; R.A. Scalzo ; D.R. Schuette ; C.G. Theoret ; D.A. Williams ;
Date:	17 Dec 2002
Subject:	astro-ph
Abstract:	STACEE is a ground based gamma-ray observatory that uses a heliostat array, built for solar energy research, to detect atmospheric Cherenkov radiation from gamma-ray initiated extensive air showers. During the first half of 2001, a prototype detector, STACEE-48, was used to detect the blazar Markarian 421, which was in an extremely active state. Observations from March to May of 2001 yielded an integral flux of (8.0+/-0.7_{stat}+/-1.5_{sys})x 10^-10 1/cm^2/s at energies above 140+/-20 GeV, and provide some evidence of correlated trends on time scales of a week or more in the GeV and X-ray bands.
Source:	arXiv, astro-ph/0301369
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