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25 April 2024

» arxiv » astro-ph/0209194

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STACEE Observations of Markarian 421 During an Extended Gamma-Ray Outburst
STACEE Collaboration: L. M. Boone ; J. A. Hinton ; D. Bramel ; E. Chae ; C. E. Covault ; P. Fortin ; D. M. Gingrich ; D. S. Hanna ; R. Mukherjee ; C. Mueller ; R. A. Ong ; K. Ragan ; R. A. Scalzo ; D. R. Schuette ; C. G. Theoret ; D. A. Williams ;
Date:	10 Sep 2002
Journal:	Astrophys.J. 579 (2002) L5-L7
Subject:	astro-ph
Abstract:	The active galaxy Markarian 421 underwent a substantial outburst in early 2001. Between January and May of that year, the STACEE detector was used to observe the source in gamma-rays between the energies of 50 and 500 GeV. These observations represent the lowest energy gamma-ray detection of this outburst by a ground-based experiment. Here we present results from these observations, which indicate an average integral gamma-ray flux of (8.0 +/- 0.7 +/- 1.5)x10^-10 1/cm^2/s. above 140 GeV. We also present a light curve for Markarian 421 as observed by STACEE from March to May, and compare our temporal, as well as spectral, measurements to those of other experiments.
Source:	arXiv, astro-ph/0209194
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