Abstract
The Major Atmospheric Cherenkov Experiment (MACE) is a large size (21 m) Imaging Atmospheric Cherenkov Telescope (IACT) installed at an altitude of 4270 m above sea level at Hanle, Ladakh in northern India. Here we report the detection of Very High Energy (VHE) γ-ray emission from Crab Nebula above 80 GeV. We analyzed ∼ 15 h of data collected at low zenith angle between November 2022 and February 2023. The energy spectrum is well described by a log-parabola function with a flux of ∼(3.46±0.26stat)×10−10TeV−1cm−2s−1, at 400 GeV with spectral index of 2.09±0.06stat and a curvature parameter of 0.08±0.07stat. The γ-rays are detected in an energy range spanning from 80GeV to ∼5TeV. The energy resolution improves from ∼ 34% at an analysis energy threshold of 80GeV to ∼ 21% above 1TeV. The daily light curve and the spectral energy distribution obtained for the Crab Nebula is in agreement with previous measurements, considering statistical and systematic uncertainties.
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