Towards a CTA high-level science analysis framework CTA as a community tool - requirements base science analysis framework on experience gained from other high-energy observatories (Fermi, INTEGRAL, Chandra, XMM, Swift, …) use wide spread data formats (FITS, VO) use widely used user interfaces (e.g. IRAF parameter files, XML formats) break down science analysis into analysis steps (executables) CTA analysis based GammaLib toolbox GammaLib: generic, self-contained, open source, multi-platform C++ library for instrument independent high-level science analysis of gamma-ray data http://sourceforge.net/projects/gammalib/ Easy installation: ./configure & make install No library dependencies = cheap maintenance Developed by CESR based on former experience with COMPTEL, INTEGRAL & Fermi Currently at prototype stage Yellow = prototype exists

Possible high-level science analysis schemes Use GammaLib as C++ API Analysis executables (ctatools) use GammaLib services Possible scheme à la Fermi : Script GammaLib (python) Access GammaLib services directly Working example: fitting the Crab using a model define in XML file (à la Fermi) $ python >>> from gammalib import * >>> >>> run = GCTAObservation() >>> run.load_binned("cntmap.fits.gz") >>> run.response("kb_E_50h_v3", "/cta/irf") >>> obs = GObservations() >>> obs.append(run) >>> models = GModels("model.xml") >>> obs.models(models) >>> opt = GOptimizerLM() >>> opt.max_iter(1000) >>> obs.optimize(opt) >>> print obs Prefactor: 1.269e-08 +/- 0.000e+00 Index: -2.163e+00 +/- 0.000e+00 Yellow = prototype exists

Status summary and Next steps Prototype GammaLib software for most components is available Prototype CTA and Fermi-LAT instrument interfaces are implemented Several prototype CTA analysis tools are written Simple CTA data analysis possible (point source fitting) Next steps Add the few missing core components to GammaLib (e.g. logging I/F) Enhance existing GammaLib core components (extended sources, more complex spectral laws, parameter error estimation) Enhance CTA instrument interface (more realistic response functions, include background handling) Add CTA analysis tools to complete analysis chain Conclusions The prototype software demonstrates that a generic gamma-ray high-level analysis framework is feasible. CTA analysis in this framework will profit from multi-mission interfaces enabling broad-band spectral analysis of sources from a few tens of keV up to tens of TeV.