An Archival Search for Very-High-Energy Counterparts to Sub-Threshold Neutron-Star Merger Candidates

C. Adams, I. Bartos, K. Corley, S. M'arka, Z. Márka, D. Veske, M. Capasso, Rene A. Ong, I. Sadeh, P. Kaaret, Weidong Jin, W. Benbow, R. Mukherjee, R. Prado, M. Lundy, Sameer Patel, P. Moriarty, Gernot Maier, A. Furniss, K. Ragan, David Williams, J. Buckley, L. Fortson, J. Quinn, J. Holder, C. Giuri, E. Pueschel, Daniel Nieto, S. O’Brien, Deivid Ribeiro, K. Pfrang, O. Gueta, G. Foote, A. Weinstein, Sajan Kumar, Tyler Williamson, D. Tak, Conor McGrath, T. Kleiner, M. Pohl, Paul Reynolds, B. Hona, D. Hanna, M. Santander, G. Sembroski, S. R. Patel, M. Errando, M. Kertzman, O. Hervet, Mireia Nievas-Rosillo, Mark Lang, E. Roache, T. Humensky, R. Shang, V. Vassiliev, A. Chromey, A. Falcone, J. Christiansen, A. Otte, A. Gent, A. Brill, J. Ryan, Kayla Farrell, G. Gillanders, Qi Feng, A. Archer, D. Kieda
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Abstract

The recent discovery of electromagnetic signals in coincidence with gravitational waves from neutron-star mergers has solidified the importance of multimessenger campaigns for studying the most energetic astrophysical events. Pioneering multimessenger observatories, such as the LIGO/Virgo gravitational wave detectors and the IceCube neutrino observatory, record many candidate signals that fall short of the detection significance threshold. These sub-threshold event candidates are promising targets for multimessenger studies, as the information provided by these candidates may, when combined with time-coincident gamma-ray observations, lead to significant detections. In this contribution, I describe our use of sub-threshold binary neutron star merger candidates identified in Advanced LIGO's first observing run (O1) to search for transient events in very-high-energy gamma rays using archival observations from the VERITAS imaging atmospheric Cherenkov telescope array. I describe the promise of this technique for future joint sub-threshold searches.
亚阈值中子星合并候选者的高能对应物档案搜索
最近发现的电磁信号与中子星合并产生的引力波相吻合,巩固了多信使运动对研究最具能量的天体物理事件的重要性。开创性的多信使天文台,如LIGO/Virgo引力波探测器和冰立方中微子天文台,记录了许多未达到探测意义阈值的候选信号。这些亚阈值事件候选者是多信使研究的有希望的目标,因为这些候选者提供的信息,当与时间一致的伽马射线观测相结合时,可能会导致重大的探测。在这篇文章中,我描述了我们使用在高级LIGO的第一次观测运行(O1)中发现的亚阈值双中子星合并候选者,利用VERITAS成像大气切伦科夫望远镜阵列的档案观测数据,在高能伽马射线中搜索瞬态事件。我描述了这种技术在未来联合亚阈值搜索中的前景。
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