Searches after Gravitational Waves Using ARizona Observatories (SAGUARO): Observations and Analysis from Advanced LIGO/Virgo's Third Observing Run
Searches after Gravitational Waves Using ARizona Observatories (SAGUARO): Observations and Analysis from Advanced LIGO/Virgo's Third Observing Run
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DOI：
10.3847/1538-4357/abeb71
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
K. Paterson;M. Lundquist;J. Rastinejad;W. Fong;D. Sand;J. Andrews;R. Amaro;O. Eskandari;
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文献类型：
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作者：
K. Paterson;M. Lundquist;J. Rastinejad;W. Fong;D. Sand;J. Andrews;R. Amaro;O. Eskandari;
随着高级LIGO/Virgo（O3）的第三次观测运行的结束，我们详细分析了17个引力波（GW）事件（7个触发和10个纯粹的偶然事件）的触发和偶然观测。我们使用Mt.莱蒙1.5米望远镜，SAGUARO的发现引擎。除了24小时内的触发事件，我们的瞬时搜索包括GW事件后<120小时的时间间隔，提供对Mt可访问的事件的1/2的观测。莱蒙1.5米望远镜。我们覆盖了单个事件的LVC总概率（P总）的2.1%-86%，在<120小时内，中位P总为1.8%。在改进我们的管道和增加偶然观察之后，我们在5个GW事件中发现了总共7个新的光学候选者，在搜索额外信息并与kilonova模型进行比较后，我们无法排除这些候选者。使用公开的和我们自己的最新数据，我们调查了这17个事件的252个光学候选人，发现只有65%的人以某种身份被社区跟进。在总共252名候选人中，我们能够排除另外12名先前报告的对应候选人。根据这些结果，我们讨论了SAGUARO GW对应搜索的经验教训。我们讨论了如何观察和候选人的后续社区协调，以及档案数据的作用，是至关重要的，以提高后续工作的效率，并防止不必要的重复工作与有限的电磁资源。
With the conclusion of the third observing run for Advanced LIGO/Virgo (O3), we present a detailed analysis of both triggered and serendipitous observations of 17 gravitational-wave (GW) events (7 triggered and 10 purely serendipitous) from the Searches After Gravitational-waves Using ARizona Observatories (SAGUARO) program. We searched a total of 4935 deg2 down to a median 5σ transient detection depth of 21.1 AB mag using the Mt. Lemmon 1.5 m telescope, the discovery engine for SAGUARO. In addition to triggered events within 24 hr, our transient search encompassed a time interval following GW events of <120 hr, providing observations on ∼1/2 of the events accessible to the Mt. Lemmon 1.5 m telescope. We covered 2.1%–86% of the LVC total probability (P total) for individual events, with a median P total ≈ 8% within <120 hr. Following improvements to our pipeline and the addition of serendipitous observations, we find a total of seven new optical candidates across five GW events, which we are unable to rule out after searching for additional information and comparing to kilonova models. Using both publicly available and our own late-time data, we investigated a total of 252 optical candidates for these 17 events, finding that only 65% were followed up in some capacity by the community. Of the total 252 candidates, we are able to rule out an additional 12 previously reported counterpart candidates. In light of these results, we discuss lessons learned from the SAGUARO GW counterpart search. We discuss how community coordination of observations and candidate follow-up, as well as the role of archival data, are crucial to improving the efficiency of follow-up efforts and preventing unnecessary duplication of effort with limited electromagnetic resources.