STACEE Observations of Markarian 421 During an Extended Gamma-Ray Outburst

Details STACEE Observations of Markarian 421 During an Extended Gamma-Ray Outburst STACEE Observations of Markarian 421 During an Extended Gamma-Ray Outburst

2002-09-10

arxiv.org/abs/astro-ph/0209194v1

Astrophys.J.579:L5-L7,2002

Astronomy and Astrophysics

Astrophysics

13 pages, 4 figures, submitted to ApJL

Scientific paper

10.1086/344815

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.

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