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

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Saha, Lab and Contreras González, José Luis and otros, ... (2019) Towards open and reproducible multi-instrument analysis in gamma-ray astronomy. Astronomy & astrophysics, 625 . ISSN 1432-0746

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Official URL: http://dx.doi.org/10.1051/0004-6361/201834938


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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.


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© ESO 2019. Artículo firmado por 22 autores. This work was supported by the Young Investigators Program of the Helmholtz Association, by the Deutsche Forschungsgemeinschaft (DFG) within the Collaborative Research Center SFB 876 "Providing Information by Resource-Constrained Analysis", project C3 and by the European Commision through the ASTERICS Horizon2020 project (id 653477). We would like to thank the H.E.S.S., MAGIC, VERITAS, and FACT collaborations for releasing the data that were used. This work made use of astropy (Astropy Collaboration 2013) and sherpa (Freeman et al. 2001). The authors are indebted to Abelardo Moralejo and Hans Dembinski for their useful suggestions on the statistical and systematic uncertainty estimation. We are grateful to the anonymous referee for improving the paper with helpful comments.

Uncontrolled Keywords:Crab-Nebula; Pulsar; TEV
Subjects:Sciences > Physics > Nuclear physics
ID Code:55768
Deposited On:28 Jun 2019 08:07
Last Modified:08 Jul 2019 17:21

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