Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session M14: Gravitational Wave Prompt Analysis and Localization |
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Sponsoring Units: GGR DAP Chair: Jonah Kanner, California Institute of Technology Room: 251AB |
Sunday, April 17, 2016 3:30PM - 3:42PM |
M14.00001: Discussion Of An Advanced LIGO Low-latency Search For Compact Binary Gravitational Waves Cody Messick Advanced ligo completed its first observing run in january, marking the beginning of a new era in gravitational wave astronomy. Low-latency pipelines searched for gravitational waves from compact binary mergers during the observing run, uploading candidate events to a database within seconds. In my presentation, we will report on the low-latency gstlal-inspiral advanced ligo search. [Preview Abstract] |
Sunday, April 17, 2016 3:42PM - 3:54PM |
M14.00002: Rapid Compact Binary Coalescence Parameter Estimation Chris Pankow, Patrick Brady, Richard O'Shaughnessy, Evan Ochsner, Hong Qi The first observation run with second generation gravitational-wave observatories will conclude at the beginning of 2016. Given their unprecedented and growing sensitivity, the benefit of prompt and accurate estimation of the orientation and physical parameters of binary coalescences is obvious in its coupling to electromagnetic astrophysics and observations. Popular Bayesian schemes to measure properties of compact object binaries use Markovian sampling to compute the posterior. While very successful, in some cases, convergence is delayed until well after the electromagnetic fluence has subsided thus diminishing the potential science return. With this in mind, we have developed a scheme which is also Bayesian and simply parallelizable across all available computing resources, drastically decreasing convergence time to a few tens of minutes. In this talk, I will emphasize the complementary use of results from low latency gravitational-wave searches to improve computational efficiency and demonstrate the capabilities of our parameter estimation framework with a simulated set of binary compact object coalescences. [Preview Abstract] |
Sunday, April 17, 2016 3:54PM - 4:06PM |
M14.00003: Coherent search for gravitational wave transients in the first advanced LIGO run Sergey Klimenko Recently LIGO detectors have been upgraded, targeting detection of gravitational waves from astrophysical sources. Advanced LIGO performed the first observing run in September, 2015 - January, 2016 at almost three times better strain sensitivity than the initial detectors. We describe a baseline search for generic gravitational wave transients conducted during the first observing run. The search pipeline coherently combines data from all detectors and identifies gravitational wave candidates with a few minutes latency. By using the constrained likelihood method, it reconstructs signal waveform and finds a source location in the sky. We present the status of the search, the performance of the search algorithm, and extensive studies of the background due to environmental and instrumental transient events. [Preview Abstract] |
Sunday, April 17, 2016 4:06PM - 4:18PM |
M14.00004: Broadband Electromagnetic Follow-up of Advanced LIGO Sources Leo Singer Advanced LIGO began observing in September 2015 with over 3 times the distance reach (27 times the sensitive volume) of its previous configuration. Some gravitational-wave sources, particularly neutron star binary mergers, are expected to produce broadband electromagnetic transients which may be crucial to understanding the astrophysical context of these events. We have assembled a consortium of over 60 ground- and space-based gamma-ray, x-ray, optical, infrared, and radio facilities collaborating to search for broadband electromagnetic counterparts of gravitational-wave sources. In this talk, we describe the LIGO/Virgo EM follow-up program and the astronomical facilities that participated during this first LIGO observing run. Then, we survey the multi-wavelength observing campaigns embarked upon for specific gravitational-wave events. Finally, we discuss lessons learned and the way forward for joint GW-EM observations in an era of increasingly sensitive GW detectors. [Preview Abstract] |
Sunday, April 17, 2016 4:18PM - 4:30PM |
M14.00005: Comparison of localizations of sources from gravitational-wave data alone Reed Essick Various gravitational-wave searches make different assumptions about the expected signals and sources. These assumptions can produce different posterior distributions for the location of possible sources. Understanding localizations from gravitational-wave data alone is crucial when interpreting the different posteriors and planning possible follow-up observations, particularly for new data recorded by the Advanced LIGO detectors. I describe a few sets of reasonable assumptions and how they affect localization, focusing on a comparison of posteriors produced by different localization algorithms using both simulated and actual data from the Advanced LIGO detectors. [Preview Abstract] |
Sunday, April 17, 2016 4:30PM - 4:42PM |
M14.00006: Never Ignore a Coincidence: Rapid Identification of Advanced LIGO Sources with Electromagnetic Transients Alex Urban When two ultra-compact objects inspiral and merge it is a rare cosmic event, resulting in ``luminous'' gravitational wave emission. It is also fleeting, staying in Advanced LIGO's current sensitive band only for at most a few minutes. But when there is at least one neutron star, disk formation during the merger may power a slew of bright electromagnetic counterparts, including short gamma-ray bursts (GRBs) and their afterglows. Here we present efforts to localize LIGO signal candidates on the sky in under a minute after detection, and to identify coincidences in time with GRBs from the \textit{Swift} and \textit{Fermi} satellites on a similar timescale. We also report on the population of \textit{Swift} and \textit{Fermi} GRBs that occurred during Advanced LIGO's first Observing Run, and discuss follow-up observations of GRB 150906B, a short-duration burst discovered by the InterPlanetary Network of satellite observatories, which may have occurred in a galaxy within LIGO's sensitive volume. [Preview Abstract] |
Sunday, April 17, 2016 4:42PM - 4:54PM |
M14.00007: Selecting Gravitational Wave Candidates for Electromagnetic Follow-up: Advanced LIGO/Virgo's Decision Making Process Min-A Cho Some of the most violent events in the universe are bright in both their gravitational wave (GW) emission \textit{and} electromagnetic (EM). This means that prospects for multi-messenger astronomy increase as more and more detectors join the search for gravitational waves. Here I present the protocol created by members of Advanced LIGO/Virgo's EM Follow-up Program which ultimately results in alerting its astronomy partners or not. I discuss the series of checks and questions performed by humans (follow-up advocates and control room personnel) and automated online software (Approval Processor). This talk will follow the fate of the gravitational wave candidate event after it first enters Advanced LIGO/Virgo's online candidate event database. [Preview Abstract] |
Sunday, April 17, 2016 4:54PM - 5:06PM |
M14.00008: Optimizing the use of 3D information for Electromagnetic Follow-up of Advanced LIGO-Virgo Events Hsin-Yu Chen, Daniel Holz As Advanced LIGO-Virgo turns on, we are entering the era of gravitational-wave astronomy. One of the most exciting scientific opportunities would be the joint observations of gravitational wave sources and their electromagnetic counterparts. A rapid directionally dependent distance estimation would allow telescopes to adjust the integration time depending on the expected distance along each direction on the sky, thereby saving resources and increasing the chance of detection. We discuss the savings in telescope time resulting from the 3D information from our low-latency gravitational-wave 3D reconstruction algorithm. The use of distance can be optimized for telescopes with different fields-of-view and sensitivities. Combining these distance estimates with galaxy catalogs, we explore the effects of incompleteness of the catalogs, the evolution of the event rates (stellar mass or star formation rate), and the uncertainties in galaxy redshift measurements. [Preview Abstract] |
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