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Galaxy-Targeting Approach Optimized for Finding the Radio Afterglows of Gravitational Wave Sources

Rana, Javed and Mooley, Kunal P. (2019) Galaxy-Targeting Approach Optimized for Finding the Radio Afterglows of Gravitational Wave Sources. . (Unpublished)

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Kilonovae and radio afterglows of neutron star merger events have been identified as the two most promising counterparts, of these gravitational wave sources, that can provide arcsecond localization. While several new and existing optical search facilities have been dedicated to finding kilonovae, factors such as dust obscuration and the daytime sky may thwart these searches in a significant fraction of gavitational wave events. Radio-only searches, being almost immune to these factors, are equally capable of finding the counterparts and in fact offer a complementary discovery approach, despite the modest fields of view for many of the present-day radio interferometers. Such interferometers will be able to carry out competitive searches for the electromagnetic counterparts through the galaxy targeting approach. Adapting and improving on an existing algorithm by Rana et al. 2017. we present here a method that optimizes the placement of radio antenna pointings, integration time, and antenna slew. We simulate 3D gravitational wave localizations to find the efficacy of our algorithm; with substantial improvements in slew overhead and containment probability coverage, our algorithm performs significantly better than simple galaxy-rank-ordered observations. We propose that telescopes such as the Very Large Array, MeerKAT, Australia Telescope Compact Array and the Gaint Meterwave Radio Telescope, having fields of view ≲1 deg² and searching for the counterparts of nearby GW events over tens of square degrees or larger, will especially benefit from this optimized galaxy-targeting approach for electromagnetic counterpart searches.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Rana, Javed0000-0001-5605-1809
Mooley, Kunal P.0000-0002-2557-5180
Additional Information:We thank Shri Kulkarni and Eran Ofek for suggestions that helped improve this paper. KPM is currently a Jansky Fellow of the National Radio Astronomy Observatory. Software: Matplotlib (Hunter 2007), NumPy (Oliphant 2006–), Astropy (Astropy Collaboration et al. 2018),
Funding AgencyGrant Number
Jansky FellowshipUNSPECIFIED
Subject Keywords:methods: observational — techniques: interferometric — surveys
Record Number:CaltechAUTHORS:20200604-151458378
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103716
Deposited By: George Porter
Deposited On:05 Jun 2020 14:17
Last Modified:05 Jun 2020 14:17

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