Measurement of the Gamma-ray Spectrum of the Crab Nebula Above 250 GEV with the CAT Cherenkov Telescope

Details Measurement of the Gamma-ray Spectrum of the Crab Nebula Above 250 GEV with the CAT Cherenkov Telescope Measurement of the Gamma-ray Spectrum of the Crab Nebula Above 250 GEV with the CAT Cherenkov Telescope

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.645t&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Crab nebula is generally considered as the standard candle for Gamma-Ray Astronomy in the very high energy range. This source was observed by the CAT imaging Cherenkov telescope (whose energy threshold is 250 GeV) during two periods: December 1996 - March 1997 and October 1997 - March 1998. Data were selected by requiring good atmospheric conditions and zenith angles lower than 40circ, representing 32 hours of ``on-source'' observations and 18 hours of ``off-source'' data. The gamma-ray rate within selection criteria is about 1.5 per minute. The energy spectrum of the source is measured above 350 GeV.

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