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
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+/-0.7stat+/-1.5sys)x 10-10 1/cm2/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.
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