1. LIGO-G050248-00-W Report on LIGO Science Run S4 Fred Raab On behalf of LIGO Scientific Collaboration

2. LIGO-G050248-00-W Raab - LIGO Science Run S42 Science Run 4 (S4) Description 22Feb05 18:00:00UTC to 24Mar05 06:00:00UTC Duration of 708 hrs Coordinated run: »LIGO Hanford 4-km (H1) interferometer, Washington, USA »LIGO Hanford 2-km (H2) interferometer, Washington, USA »LIGO Livingston 4-km (L1) interferometer, Louisiana, USA »GEO600 0.6-km interferometer, Hannover, Germany »Allegro resonant-bar detector, Louisiana, USA »Auriga resonant-bar detector, Legnaro, Italy

3. LIGO-G050248-00-W Raab - LIGO Science Run S43 LIGO (Washington)LIGO (Louisiana) LIGO Detector Description Funded by the National Science Foundation; operated by Caltech and MIT; the research focus for more than 500 LIGO Science Collaboration members worldwide.

4. LIGO-G050248-00-W Raab - LIGO Science Run S44 Basic Signature of Gravitational Waves for All Detectors

5. LIGO-G050248-00-W Raab - LIGO Science Run S45 Recycling Mirror Optical Cavity 4 km or 2-1/2 miles Beam Splitter Laser Photodetector Fabry-Perot-Michelson with Power Recycling

6. LIGO-G050248-00-W Raab - LIGO Science Run S46 Clean Science Duty Cycle (segments > 300 seconds) H1: 80.5% H2: 81.4% L1: 74.5%

7. LIGO-G050248-00-W Raab - LIGO Science Run S47 Interferometer Strain Sensitivity

8. LIGO-G050248-00-W Raab - LIGO Science Run S48 Stability

9. LIGO-G050248-00-W Raab - LIGO Science Run S49 S4 Analysis Underway Bursts Inspirals Periodic Stochastic

10. LIGO-G050248-00-W Raab - LIGO Science Run S410 Up Next… Approach closer to design goal sensitivity »Increase laser power to close shot-noise gap above 150 Hz »Improve thermal compensation of mirror figure »Improve RF oscillator phase stability »Improve rejection of line harmonics, especially near expected Crab Pulsar frequency »Improve acoustic isolation, especially for H1, H2 pair (important for stochastic search) »Improve alignment stability »Improve robustness against upconversion noise Commence S5 and accumulate one year of science data

11. LIGO-G050248-00-W Raab - LIGO Science Run S411 LIGO Search Papers (as of 9May05) S1: “Setting upper limits on the strength of periodic gravitational waves using the first science data from the GEO600 and LIGO detectors”, Phys. Rev. D 69, 082004 (2004) “First upper limits from LIGO on gravitational wave bursts”, Phys. Rev. D 69, 102001 (2004) “Analysis of LIGO data for gravitational waves from binary neutron stars”, Phys. Rev. D 69, 122001 (2004) “Analysis of first LIGO science data for stochastic gravitational waves”, Phys. Rev. D 69, 122004 (2004) S2: “Limits on gravitational wave emission from selected pulsars using LIGO data”, Phys. Rev. Lett. 94, 181103 (2005). “A search for gravitational waves associated with the gamma ray burst GRB030329 using the LIGO detectors”, gr-qc/0501068 “Upper limits on gravitational wave bursts from LIGO’s second science run”, gr-qc/0505029