@article{341b0818b66e4b88ae3a7b8669a269e8,
title = "Improvements in Gravitational-wave Sky Localization with Expanded Networks of Interferometers",
abstract = "A milestone of multi-messenger astronomy has been achieved with the detection of gravitational waves from a binary neutron star merger accompanied by observations of several associated electromagnetic counterparts. Joint observations can reveal details of the engines that drive the electromagnetic and gravitational-wave emission. However, locating and identifying an electromagnetic counterpart to a gravitational-wave event is heavily reliant on localization of the source through gravitational-wave information. We explore the sky localization of a simulated set of neutron star mergers as the worldwide network of gravitational-wave detectors evolves through the next decade, performing the first such study for neutron star-black hole binary sources. Currently, three detectors are observing with additional detectors in Japan and India expected to become operational in the coming years. With three detectors, we recover a median neutron star-black hole binary sky localization of 60 deg2 at the 90% credible level. As all five detectors become operational, sources can be localized to a median of 11 deg2 on the sky.",
keywords = "gravitational waves, stars: neutron",
author = "Chris Pankow and Chase, {Eve A.} and Scott Coughlin and Michael Zevin and Vassiliki Kalogera",
note = "Funding Information: C.P. and V.K. are supported by the NSF grant PHY-1607709; parts of this work were performed at the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607761. C.P. also acknowledges support by the Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA). E.A.C. thanks the LSSTC Data Science Fellowship Program; her time as a fellow has benefited this work. S.C. is supported by the National Science Foundation, award INSPIRE 15-47880. M.Z. acknowledges support from the Reach for the Stars GK-12 program, NSF grant DGE-1007911. E.A.C. and M.Z. also acknowledge support from the Illinois Space Grant Consortium Graduate Fellowship Program. This research was supported in part through the computational resources from the Grail computing cluster—funded through NSF Gravitational Physics—and staff contributions provided for the Quest high performance computing facility at Northwestern University, which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology. Additionally, the authors would like to thank Hsin-Yu Chen and Adam Miller for insightful commentary on the manuscript. We are also very grateful for the assistance of Andrew Kim and William Tong in the development of the work. Publisher Copyright: {\textcopyright} 2018. The American Astronomical Society. All rights reserved.",
year = "2018",
month = feb,
day = "20",
doi = "10.3847/2041-8213/aaacd4",
language = "English (US)",
volume = "854",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "2",
}