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Towards open and reproducible multi-instrument analysis in gamma-ray astronomy

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Other literature type , Journal 30 Apr 2019Embargo end date: 01 Jan 2019 France, France, France, France, Spain, Germany, France, France, Spain, France Publisher:EDP SciencesJournal:Astronomy & Astrophysics, volume 625, page A10 (issn: 0004-6361, eissn: 1432-0746,

Authors: Nigro, C.; Deil, C.; Zanin, R.; Hassan, T.; King, J.; Ruiz, J. E.; Saha, L.; +15 Authors

doi: 10.1051/0004-6361/201834938 , 10.48550/arxiv.1903.06621 , 10.3204/pubdb-2019-02716

arXiv: 1903.06621 , http://arxiv.org/abs/1903.06621

handle: 10261/189000 , 20.500.14352/13396

Towards open and reproducible multi-instrument analysis in gamma-ray astronomy

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Abstract

The analysis and combination of data from different gamma-ray instruments involves the use of collaboration proprietary software and case-by-case methods. The effort of defining a common data format for high-level data, namely event lists and instrument response functions (IRFs), has recently started for very-high-energy gamma-ray instruments, driven by the upcoming Cherenkov Telescope Array (CTA). In this work we implemented this prototypical data format for a small set of MAGIC, VERITAS, FACT, and H.E.S.S. Crab nebula observations, and we analyzed them with the open-source gammapy software package. By combining data from Fermi-LAT, and from four of the currently operating imaging atmospheric Cherenkov telescopes, we produced a joint maximum likelihood fit of the Crab nebula spectrum. Aspects of the statistical errors and the evaluation of systematic uncertainty are also commented upon, along with the release format of spectral measurements. The results presented in this work are obtained using open-access on-line assets that allow for a long-term reproducibility of the results.

Countries

France, France, France, France, Spain, Germany, France, France, Spain, France

Related Organizations

University of California System
United States
Department of Physics and Astronomy University of Rochester
United States
University of Chicago
United States
Spanish National Research Council
Spain
Heidelberg University
Germany

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Keywords

Cherenkov Telescope Array, atmosphere [Cherenkov counter], Crab-Nebula, VHE [gamma ray], HESS, data analysis [Methods], energy spectrum [gamma ray], High Energy Astrophysical Phenomena (astro-ph.HE), imaging, statistical [error], Monte Carlo [numerical calculations], 520, error: statistical, upgrade, VERITAS, Física nuclear, numerical calculations: Monte Carlo, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, on-line, data analysis method, 539.1, Gamma rays: general, general [Gamma rays], FOS: Physical sciences, Cherenkov counter: atmosphere, 530, programming, gamma ray: energy spectrum, GLAST, energy dependence, Methods: data analysis, data analysis [methods], Pulsar, photomultiplier: silicon, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation and Methods for Astrophysics (astro-ph.IM), background, gamma rays: general, 2207 Física Atómica y Nuclear, MAGIC, methods: data analysis, gamma ray: VHE, spectral, TEV, silicon [photomultiplier], [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], general [gamma rays], ddc: ddc:520

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joint-crab software on GitHub
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