scholarly journals Assessing the compact-binary merger candidates reported by the MBTA pipeline in the LIGO-Virgo O3 run: probability of astrophysical origin, classification, and associated uncertainties

2022 ◽  
Author(s):  
Dimitri Estevez ◽  
Nicolas Andres ◽  
Maria Assiduo ◽  
Florian Aubin ◽  
Roberto Chierici ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
The Third ◽  
Compact Binary ◽  
Systematic Uncertainties ◽  
Template Analysis ◽  
Technical Details ◽  
Offline Analysis ◽  
Multi Band

Abstract We describe the method used by the Multi-Band Template Analysis (MBTA) pipeline to compute the probability of astrophysical origin, pastro, of compact binary coalescence candidates in LIGO-Virgo data from the third observing run (O3). The calculation is performed as part of the offline analysis and is used to characterize candidate events, along with their source classification. The technical details and the implementation are described, as well as the results from the first half of the third observing run (O3a) published in GWTC-2.1. The performance of the method is assessed on injections of simulated gravitational-wave signals in O3a data using a parameterization of pastro as a function of the MBTA combined ranking statistic. Possible sources of statistical and systematic uncertainties are discussed, and their effect on pastro quantified.

scholarly journals Virgo and Gravitational-Wave Computing in Europe

2020 ◽  
Vol 245 ◽  
pp. 07050
Author(s):  
Stefano Bagnasco
Keyword(s):  
Gravitational Wave ◽  
Current Status ◽  
Low Latency ◽  
Observational Period ◽  
Compact Binaries ◽  
The Third ◽  
Compact Binary ◽  
Continuous Waves ◽  
The Us ◽  
Wave Event

Advanced Virgo is an interferometer for the detection of gravitational waves at the European Gravitational Observatory in Italy. Along with the two Advanced LIGO interferometers in the US, Advanced Virgo is being used to collect data from astrophysical sources such as compact binary coalescences and is currently running the third observational period, collecting gravitational wave event candidates at a rate of more than once per week. Data from the interferometer are processed by running search pipelines for several expected signals, from coalescing compact binaries to continuous waves and burst events. Furthermore, detector characterisation studies are run. Some of the processing needs to be done with low latency, to be able to provide triggers for other observatories and make multi-messenger observations possible. Deep searches are run offline on external computing centres. Thus, data needs also to be reliably and promptly distributed from the EGO site to computer centres in Europe and the US for further analysis and archival storage. Two of the defining characteristics of Virgo computing are the heterogeneity of the activities and the need to interoperate with LIGO. A very wide array of analysis pipelines differing in scientific target, implementation details and running environment assumptions have to be allowed to run ubiquitously and uniformly on dedicated resources and, in perspective, on heterogeneous infrastructures. The current status, possible strategies and outlook of Virgo computing are discussed.

scholarly journals Real-time Search for Compact Binary Mergers in Advanced LIGO and Virgo's Third Observing Run Using PyCBC Live

2021 ◽  
Vol 923 (2) ◽  
pp. 254
Author(s):  
Tito Dal Canton ◽  
Alexander H. Nitz ◽  
Bhooshan Gadre ◽  
Gareth S. Cabourn Davies ◽  
Verónica Villa-Ortega ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Frequency Domain ◽  
Rapid Identification ◽  
Matched Filtering ◽  
Low Latency ◽  
The Third ◽  
Compact Binary ◽  
Binary Mergers ◽  
And Performance

Abstract The third observing run of Advanced LIGO and Advanced Virgo took place between 2019 April and 2020 March and resulted in dozens of gravitational-wave candidates, many of which are now published as confident detections. A crucial requirement of the third observing run was the rapid identification and public reporting of compact binary mergers, which enabled massive follow-up observation campaigns with electromagnetic and neutrino observatories. PyCBC Live is a low-latency search for compact binary mergers based on frequency-domain matched filtering, which was used during the second and third observing runs, together with other low-latency analyses, to generate these rapid alerts from the data acquired by LIGO and Virgo. This paper describes and evaluates the improvements made to PyCBC Live after the second observing run, which defined its operation and performance during the third observing run.

scholarly journals Optimizing multitelescope observations of gravitational-wave counterparts

2019 ◽  
Vol 489 (4) ◽  
pp. 5775-5783 ◽  
Author(s):  
Michael W Coughlin ◽  
Sarah Antier ◽  
David Corre ◽  
Khalid Alqassimi ◽  
Shreya Anand ◽  
...  
Keyword(s):  
Neutron Stars ◽  
Gravitational Wave ◽  
Open Source Software ◽  
Event Rate ◽  
Ease Of Use ◽  
The Third ◽  
Compact Binary ◽  
Binary Mergers ◽  
Significant Effort

ABSTRACT The ever-increasing sensitivity of the network of gravitational-wave detectors has resulted in the accelerated rate of detections from compact binary coalescence systems in the third observing run of Advanced LIGO and Advanced Virgo. Not only has the event rate increased, but also the distances to which phenomena can be detected, leading to a rise in the required sky volume coverage to search for counterparts. Additionally, the improvement of the detectors has resulted in the discovery of more compact binary mergers involving neutron stars, revitalizing dedicated follow-up campaigns. While significant effort has been made by the community to optimize single telescope observations, using both synoptic and galaxy-targeting methods, less effort has been paid to coordinated observations in a network. This is becoming crucial, as the advent of gravitational-wave astronomy has garnered interest around the globe, resulting in abundant networks of telescopes available to search for counterparts. In this paper, we extend some of the techniques developed for single telescopes to a telescope network. We describe simple modifications to these algorithms and demonstrate them on existing network examples. These algorithms are implemented in the open-source software gwemopt, used by some follow-up teams, for ease of use by the broader community.

scholarly journals Biases in parameter estimation from overlapping gravitational-wave signals in the third-generation detector era

2021 ◽  
Vol 104 (4) ◽  
Author(s):  
Anuradha Samajdar ◽  
Justin Janquart ◽  
Chris Van Den Broeck ◽  
Tim Dietrich
Keyword(s):  
Parameter Estimation ◽  
Gravitational Wave ◽  
Third Generation ◽  
The Third
Sign in / Sign up

Export Citation Format

Share Document