GEO600 Data Analysis Status

Bernard SchutzAlbert Einstein Institute

Potsdam/Golm

Bernard F Schutz Albert Einstein Institute

17 December 2003

GEO Data Analysis

2

GEO Participation in Science Runs• GEO participated fully in S1, LSC analysis essentially

finished. Two LSC working group co-chairs are GEO members: MA Papa (pulsar searches), J Romano (stochastic).

• GEO did not participate in S2; installing signal recycling mirror.

• Just before beginning of S3, GEO scientists succeeded in learning how to control IFO with signal recycling mirror: a crucial step in GW detector development. This demonstrates a technique that will be central to the Advanced LIGO upgrade.

• GEO participated in S3 for first week, then withdrew in order to improve sensitivity. Not yet clear when it will rejoin S3. Excellent stability: duty cycle during first week was 95%.

• See talks by J Smith, M Hewitson (Friday).

Bernard F Schutz Albert Einstein Institute

17 December 2003

GEO Data Analysis

3

GEO Data Analysis People• GEO coordinates its data activities within the project:

Ik Siong HengBursts

Stansilav BabakInspirals

Alberto VecchioStochastic

M A PapaGEO Data Analysis Coordinator

+ Pulsars

• GEO Detector Characterization: A Sintes, K Strain• GEO Calibration: H Ward, M Hewitson• GEO data distribution and exchange: S Grunewald, D

Churches.

Bernard F Schutz Albert Einstein Institute

17 December 2003

GEO Data Analysis

4

GW pulsar analysis• See talks by G Woan, R Dupuis, A Vecchio (Thursday), poster by

M A Papa.• GEO has contributed the main pulsar search codes to the LSC: (1)

coherent demodulation, (2) Bayesian targeted searches using heterodyning, (3) Hough transform hierarchical search.

• First two codes used for analysis of S1 data from 4 detectors; LSC set 95% confidence upper limit ellipticity of PSR J 1939+2134 at 1284 Hz:

ε < 2.9 × 10-4 (gr-qc/0308050, accepted PRD)• S2 search widened to include all known pulsars plus first use of

Hough transform to perform area search for unknown neutron stars.

• S2 analysis also includes searches for pulsars in binaries, searches for accreting neutron stars (Sco X-1).

Bernard F Schutz Albert Einstein Institute

17 December 2003

GEO Data Analysis

5

Inspiral analysis• See talk by T Cokelaer (Thursday)• GEO generating PN templates, template bank.

Tests of template placement using injected signals very satisfactory.

488%818592252

Detection statistic for S1 hardware injections

Error in: Chirp mass <5%, Total mass < 10%, Distance <20%

1100%167169167251

293%126128135250

false alarmsdetectedidentifiedcandidatesinjectedDay

• S3 plans: spinning BH inspiral templates

Bernard F Schutz Albert Einstein Institute

17 December 2003

GEO Data Analysis

6

Stochastic analysis

• See talks by J Romano, T Regimbau• GEO-LIGO correlations inherently less sensitive

due to longer baseline, but provide useful check on instrumental/analysis effects.

• First such correlations will be performed with S3 data. Software for LAL/LALApps currently being validated.

Bernard F Schutz Albert Einstein Institute

17 December 2003

GEO Data Analysis

7

Burst analysis• See talks by S Heng (Thursday), R

Balasubramanian (Saturday), poster by S Heng.• The goal is to bring GEO S3 data into a multi-

detector analysis. Different orientation and sensitivity bandwidth of GEO make this analysis interesting and non-trivial.

• Excess power and TFClusters generate events.• Practical problems: GEO data double-precision,

GEO++/HACR pipeline outside LAL.

Bernard F Schutz Albert Einstein Institute

17 December 2003

GEO Data Analysis

8

GEO cluster computers

• Merlin (AEI/Golm): 180 dual-CPU Athlonnodes, 64 TB disk space

• Explorer (Cardiff):80 dual-CPU Athlon nodes, 20 TB disk space

• Tsunami (Birmingham): 100 dual-CPU Xeon nodes, 10 TB disk space