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Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..367m&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
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Scientific paper
CELESTE is a ground-based gamma ray experiment that samples the Cherenkov light emitted by atmospheric shower. Its detection threshold is under 100 GeV. Since 2000, the detector has been upgraded by adding 13 channels and improving the quality of our Flash ADC. In addition, 12 heliostats are used to measure the extent of the atmospheric shower while the others aim at the electromagnetic shower maximum at 11 km above the ground. To increase the Cherenkov to night sky light ratio, Flash ADC data are summed over all the channels. The shape of this sum depends on the nature and on the impact parameter of the shower in the 11 km plane. Using the difference between hadronic and electromagnetic showers, a substantial part of the hadronic background is rejected leading to a sensitivity of 5 sigma/sqrt{hour} on the Crab Nebula, with a gamma-to-cosmic ray ratio of 25%. This allowed us to detect the blazar Markarian 421 in flaring states in 2003 and 2004.
CELESTE Collaboration
Manseri Hakima
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