Joint LIGOTAMA Inspiral Analysis

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Joint LIGO-TAMA Inspiral Analysis

• Steve Fairhurst
• UW--Milwaukee
• In collaboration with Patrick Brady, Nobuyuki
  Kanda,
• Hideyuki Tagoshi, Hirotaka Takahashi, Daisuke
  Tatsumi, and LIGO--TAMA joint working group
• LIGO-G040127-00-Z

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LIGO TAMA inspiral analysis

• LIGO S2 inspiral analysis uses two site
  coincident data.
• TAMAs DT8 occurred at the same time as S2.
• Both LIGO and TAMA sensitive to binary NS
  inspirals in the Milky Way.
• Analyze LIGO single site data in coincidence with
  TAMA.

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Goals of the Search

• The ultimate goal of the search is a detection.
• Alternatively, we can improve the upper limit,
• R 2.3/eTobs NMWEG
• Use about 700 hours of data.
• Sensitive to most of the Milky Way.
• Rate comparable to LIGO S2 result.
• Interesting issue how to combine upper limit
  from two separate searches.

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Search Strategy

• LIGO and TAMA detectors analyzed independently
  for inspiral triggers.
• We make use of data analysis infrastructure
  created for S2 analysis.
• Triggers (mass, SNR, chi squared, end time)
  exchanged and searched for coincidence.
• Tune coincidence parameters (mass and time) with
  software injections.
• Use time slides to estimate background.
• Combine with LIGO result to obtain upper limit.

5
Preliminary Injection Result

• Injected two 1.4-1.4 optimally oriented binaries.
• Triggers obtained in both LIGO and TAMA, and
  exchanged.
• Very preliminary coincidence study both
  injections found coincident in mass and time.

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Summary

• Single site LIGO S2 data will be analyzed in
  coincidence with TAMA for inspiral signals.
• Agreed format for swapping triggers.
• Major work needed in tuning coincidence
  parameters done with signal injections.
• First triggers exchanged and injections
  successfully found in coincidence.