Gammapy - A prototype for the CTA science tools

Gammapy is a Python package for high-level gamma-ray data analysis built on Numpy, Scipy and Astropy. It enables us to analyze gamma-ray data and to create sky images, spectra and lightcurves, from event lists and instrument response information, and to determine the position, morphology and spectra of gamma-ray sources. So far Gammapy has mostly been used to analyze data from H.E.S.S. and Fermi-LAT, and is now being used for the simulation and analysis of observations from the Cherenkov Telescope Array (CTA). We have proposed Gammapy as a prototype for the CTA science tools. This contribution gives an overview of the Gammapy package and project and shows an analysis application example with simulated CTA data.

[1]  Stephen M. Doe,et al.  Fitting and Estimating Parameter Confidence Limits with Sherpa , 2011 .

[2]  Christoph Deil,et al.  Gammapy: high level data analysis for extragalactic science cases with the Cherenkov Telescope Array , 2017, 1709.10169.

[3]  V. Zabalza,et al.  naima: a Python package for inference of relativistic particle energy distributions from observed nonthermal spectra , 2015, 1509.03319.

[4]  P. Goudfrooij,et al.  Where Will PyRAF Lead Us? The Future of Data Analysis Software at STScI , 2006 .

[5]  William D. Pence,et al.  CFITSIO: A FITS File Subroutine Library , 2010 .

[6]  Tom Aldcroft Keeping the Chandra Satellite Cool with Python , 2010 .

[7]  Peter Greenfield What Python Can Do for Astronomy , 2011 .

[8]  Mathieu Servillat,et al.  Open high-level data formats and software for gamma-ray astronomy , 2016 .

[9]  Christoph Deil,et al.  PyFACT: Python and FITS analysis for Cherenkov telescopes , 2012 .

[10]  Eric Jones,et al.  SciPy: Open Source Scientific Tools for Python , 2001 .

[11]  Christoph Deil,et al.  The $\gamma$-ray Milky Way above 10 GeV: Distinguishing Sources from Diffuse Emission , 2015, 1506.02319.

[12]  Prasanth H. Nair,et al.  Astropy: A community Python package for astronomy , 2013, 1307.6212.

[13]  Erik Tollerud,et al.  Software Use in Astronomy: an Informal Survey , 2015, ArXiv.

[14]  Christoph Deil,et al.  Gammapy - A Python package for {\gamma}-ray astronomy , 2015, 1509.07408.

[15]  Robert H. Lupton,et al.  Investigating interoperability of the LSST data management software stack with Astropy , 2016, Astronomical Telescopes + Instrumentation.

[16]  Ian N. Evans,et al.  Sherpa: 1D/2D modeling and fitting in Python , 2009 .

[17]  M. R. Calabretta Wcslib and Pgsbox , 2011 .

[18]  John D. Hunter,et al.  Matplotlib: A 2D Graphics Environment , 2007, Computing in Science & Engineering.

[19]  Gaël Varoquaux,et al.  The NumPy Array: A Structure for Efficient Numerical Computation , 2011, Computing in Science & Engineering.

[20]  Aneta Siemiginowska,et al.  Sherpa: a mission-independent data analysis application , 2001, SPIE Optics + Photonics.

[21]  D. Berge,et al.  Background modelling in very-high-energy γ-ray astronomy , 2006 .

[22]  Howard A. Bushouse,et al.  The James Webb Space Telescope Data Calibration Pipeline , 2015 .