Summary Introduction: vhe -ray astronomy and magic



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tarix31.10.2017
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Summary

  • Introduction: VHE -ray astronomy and MAGIC

  • Data handling at MAGIC

  • GRID at MAGIC

  • Virtual observatory

  • Conclusions



VHE astronomy





Scientific highlights

  • MAGIC has discovered 10 new VHE -ray sources (7 extragalactic + 3 galactic)

  • New populations unveiled (radio-quasar, micro-quasar)

  • Farthest ever observed object at these energies (z = 0.54)

  • GRBs observed (not detected) during the prompt emission

  • Big flares used to test Lorentz invariance

  • So far, we have published ~30 papers and many more are in the pipeline





Raw data volume



Data flow



MAGIC/PIC Data center



Trends foreseen for 2008

  • Philosophy:

    • Adopt Grid to allow MAGIC users to do better science
    • “If it ain’t broken, don’t fix it”
  • Leverage worldwide mutual trust agreement for Grid certificates to simplify user ID management for:

    • Interactive login (ssh → gsi-ssh or equivalent)
    • Casual file transfer (https via Apache+mod_gridsite or gridftp)
  • Move to batch submission via Grid tools in order to unify CPU accounting with LHC

  • Setup the Grid utility “reliable File Transfer Service” to automate file distribution between MAGIC Datacenter @ PIC and sites which regularly subscribe many datasets

  • PIC/IFAE will have specific resources to help with this, partially thanks to funding from the EGEE-III project

  • Integrate into the procedure for opening an account in the Datacenter the additional steps for a user to get a Grid certificate and to be included as member of the MAGIC VO.



Monte Carlo simulation

  • The recorded data are mainly background events due to charged cosmic rays (CR)

  • Background rejection needs large samples of Monte Carlo simulated -ray and CR showers

  • Very CPU consuming (1 night of background > 106 computer days )

  • Access to simulated samples, MC production coordination, scalability (MAGIC II, CTA...)

  • GRID can help with these issues









Status MC production

  • Last data challenge (from September 2005) produced ~15000 simulated -ray showers, ~4% failures

  • After that H. Kornmayer left the project, has been stalled since.

  • New crew taking over the VO (UCM Madrid + INSA + Dortmund).

  • Plan to start producing MC for MAGIC-II soon



Virtual observatory





Summary

  • MAGIC scientific program requires large computing power and storage capacity

  • Data center at PIC/IFAE (Barcelona) is up and start official operation in September 2008 with MAGIC-II

  • Massive MC production for MAGIC-II will involve GRID

  • (Some) Data will be release through virtual observatory

  • Good benchmark for other astro-particle present and future projects




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