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- · arXiv e-print (arXiv:1308.6081)
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| Title: |
| Toward finding gravitational-wave signals from progenitors of short hard gamma-ray bursts and orphaned afterglows |
| Authors: |
| Ghosh, Shaon; Bose, Sukanta |
| Publication: |
| eprint arXiv:1308.6081 |
| Publication Date: |
| 08/2013 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - High Energy Astrophysical Phenomena, General Relativity and Quantum Cosmology |
| Comment: |
| 28 pages, 15 figures |
| Bibliographic Code: |
| 2013arXiv1308.6081G |
Abstract
With multiple observatories and missions being planned for detecting
orphaned afterglows associated with gamma-ray bursts (GRBs) we emphasize
the importance of developing data analysis strategies for searching
their possible counterpart signals in the data of
gravitational wave
(GW) detectors in the advanced detector era. This is especially
attractive since
short hard gamma-ray bursts (SGRBs) may have compact
binary coalescences involving neutron stars (CBCNSs) as their
progenitors, which emit gravitational waves. Joint electromagnetic (EM)
and GW observations of these objects will enrich our understanding of
their beaming, energetics, galactic environment, and shed light on a
host of other outstanding questions related to them. Here we recognize
some of the astrophysical factors that determine what fraction of CBCNS
sources can generate orphaned afterglows. Pipelines already exist that
target the sky-position and time of occurrence of SGRBs, known from EM
observations, to search for their counterparts in GW detector data.
Modifying them to analyze extended periods of time in the GW data in the
past of the afterglow detection, while targeting a single sky-position,
can search for GWs from the common progenitor. We assess the improvement
in GW
detectability to be had from utilizing the sky-position
information. We also propose a method for improving the detection
efficiency of targeted searches of GW signals from the putative CBCNS
sources of afterglows and short gamma ray bursts in the presence of
errors in detector calibration or CBCNS waveform models used in the
search. The improvement arises from searching in a wider patch of the
sky even when the sky-position is known accurately from EM observations
and utilizes the covariance of the errors in waveform parameters with
those in the sky position.
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