Cross Calibration of Telescope Optical Throughput Efficiencies using Reconstructed Shower Energies for the Cherenkov Telescope Array

Abstract

For reliable event reconstruction of Imaging Atmospheric Cherenkov Telescopes (IACTs), calibration of the optical throughput efficiency is required. Within current facilities, this is achieved through the use of ring shaped images generated by muons. Here, a complementary approach is explored, achieving cross calibration of elements of IACT arrays through pairwise comparisons between telescopes, focussing on its applicability to the upcoming Cherenkov Telescope Array (CTA). Intercalibration of telescopes of a particular type using eventwise comparisons of shower image amplitudes has previously been demonstrated to recover the relative telescope optical responses. A method utilising the reconstructed energy as an alternative to image amplitude is presented, enabling cross calibration between telescopes of varying types within an IACT array. Monte Carlo studies for two plausible CTA layouts have shown that this calibration procedure recovers the relative telescope response efficiencies at the few percent level.

8 pages, 4 figures, accepted for publication in Astroparticle Physics

References in corpus (4)

• Observations of the Crab Nebula with H.E.S.S
• Teraelectronvolt Astronomy
• Progress in Monte Carlo design and optimization of the Cherenkov Telescope Array
• Schwarzschild-Couder two-mirror telescope for ground-based gamma-ray astronomy

Cited by in corpus (4)

• Using Muon Rings for the Calibration of the Cherenkov Telescope Array: A Systematic Review of the Method and its Potential Accuracy
• The throughput calibration of the VERITAS telescopes
• Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review
• Inter-Calibration of Atmospheric Cherenkov Telescopes with UAV-based Airborne Calibration System