Simulating 1yr of sky with gtobssim

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Simulating 1-yr of sky with gtobssim
(logo by S. Ciprini)

• Nicola Omodei for the Source Simulation group
• INFN Pisa

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Purpose

• Simulate 1-yr observation sim run
• Create a 1-yr skymodel fro the Gleam run
• Extend the source populations
• Sensitivity threshold (BLLac,)
• Number of sources (both for sensitivity, and
  GRBs)
• 1yr long lightcurve definition
• Pulsar (ephemerides definition)
• AGN flares
• Solar flares
• Test any upgrade from the development of new
  model/refinement of existing ones (case by case,
  see Fridays presentation)
• 1 year time history (rocking, no-pointing)
• Test the data server, the merging procedure and
  th edata handling with such amount of data,

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The source simulation group

• A group of people (1 from each Science Group)
  that provides different pieces of the sky, and
  puts them together
• Stefan Funk, Jim Chiang, Max Razzano, Seth Digel,
  Ping Wang, Alice Harding, Nicola Omodei (
  Julie)
• 1) Science Group wishes -gt devel. their model (or
  taken the DC2 one) Extension to 1 year
• 2) Collect the xml_libraries, the source files
  (.fits, .dat, .txt) into a common location.
• 3) Start to do some tests.
• Individual sources for one year, many sources for
  few runs.
• With and without the FT2 file
• Using the farm (using the SLAC builds)
• Prepare the final sky model
• 4) Submitting jobs (in number of 1500) to the
  farm with the full facility (thank you Tom!)
• 5) 1st Quick look at the results
• 6) Merging the files (not so easy!)
• 7) Data are ready to be distributed (with other
  infrastructures)

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The group picture

• 11015 source ids (730 suns, 8760 moons)
• 7596 real sources (1 Sun, 1 Moon, 6070 Blazars)
• Galactic and extragalactic diffuse. Dark matter
  sources,

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Some numbers
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Do you know that

• The most intense point source in the SC1 sky is a
  GRB
• GRB_00539 (alias GRB 0 mc_src_id7539. Generated
  1979961, detected 261267 !!!
• The faintest point source in the sky is a GRB
  too!
• We generate 1462747153 (1.46 109) photons,
  detecting 19279683 (1.9107) photons 1.3
• 59 of the detected photons come from galactic
  diffuse emission (GALPROP)
• 11 come from extragalactic diffuse
• 16 is from Blazars
• 5 from pulsars
• 1 from GRBs

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Issues, problems and lession learned

• Some bugs in the code, some were solved for DC2,
  somewhere re-introduced
• Never debug without a spacecraft history file!
  many problems were encountered when we put the
  FT2 file in the simulation