A VOEvent-based automatic trigger system for the Murchison Widefield Array
A VOEvent-based automatic trigger system for the Murchison Widefield Array
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DOI：
10.1017/pasa.2019.40
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发表时间：
2019-10
影响因子：
6.3
通讯作者：
Paul J. Hancock;G. Anderson;A. Williams;M. Sokolowski;S. Tremblay;A. Rowlinson;B. Crosse;B. W. Meyers;Christene Lynch;A. Zic;A. Beardsley;D. Emrich;T. Franzen;L. Horsley;M. Johnston-Hollitt;D. Kaplan;D. Kenney;M. Morales;D. Pallot;K. Steele;S. Tingay;C. Trott;M. Walker;R. Wayth;Chen Wu
中科院分区：
文献类型：
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作者：
Paul J. Hancock;G. Anderson;A. Williams;M. Sokolowski;S. Tremblay;A. Rowlinson;B. Crosse;B. W. Meyers;Christene Lynch;A. Zic;A. Beardsley;D. Emrich;T. Franzen;L. Horsley;M. Johnston-Hollitt;D. Kaplan;D. Kenney;M. Morales;D. Pallot;K. Steele;S. Tingay;C. Trott;M. Walker;R. Wayth;Chen Wu
Murchison Widefield阵列是一种电子操纵的低频(300 MHz)射电干涉仪，回转时间小于8 S。低频(∼)射电望远镜因其大视场、相干发射的倒谱以及1 GHz和100 MHz脉冲之间的色散延迟在1-10分钟数量级(色散测量为100-2000pC/cm~3)而非常适合于瞬变的快速响应跟踪。MWA此前已被用于使用响应伽马射线坐标网络分组通知的系统，为包括伽马射线暴(GRB)、快速射电暴(FRB)和引力波在内的瞬变事件提供快速跟踪。我们描述了一个基于虚拟天文台事件标准触发器的自动触发MWA观测的系统，该系统比以前的系统更灵活、更有能力、更准确。该系统可以对外部多信使触发做出反应，这使得它非常适合于搜索伽玛暴的即时相干射电发射，研究伽玛暴和引力波，研究脉冲星的单脉冲，以及快速跟踪耀斑恒星的高能超耀斑。新的触发系统具有在常规相关器模式(仅限于≥0.5 S积分)和使用微波辐射的电压捕获系统(VCS，0.1ms积分)下触发观测的能力，代表了微波辐射的一种新的运行模式。升级后的标准相关器触发能力自2018b MWA观测学期(2018年7-12月)开始使用，VCS和缓冲模式触发器将在未来一个学期用于观测。
Abstract The Murchison Widefield Array (MWA) is an electronically steered low-frequency (<300 MHz) radio interferometer, with a ‘slew’ time less than 8 s. Low-frequency (∼100 MHz) radio telescopes are ideally suited for rapid response follow-up of transients due to their large field of view, the inverted spectrum of coherent emission, and the fact that the dispersion delay between a 1 GHz and 100 MHz pulse is on the order of 1–10 min for dispersion measures of 100–2000 pc/cm3. The MWA has previously been used to provide fast follow-up for transient events including gamma-ray bursts (GRBs), fast radio bursts (FRBs), and gravitational waves, using systems that respond to gamma-ray coordinates network packet-based notifications. We describe a system for automatically triggering MWA observations of such events, based on Virtual Observatory Event standard triggers, which is more flexible, capable, and accurate than previous systems. The system can respond to external multi-messenger triggers, which makes it well-suited to searching for prompt coherent radio emission from GRBs, the study of FRBs and gravitational waves, single pulse studies of pulsars, and rapid follow-up of high-energy superflares from flare stars. The new triggering system has the capability to trigger observations in both the regular correlator mode (limited to ≥0.5 s integrations) and using the Voltage Capture System (VCS, 0.1 ms integration) of the MWA and represents a new mode of operation for the MWA. The upgraded standard correlator triggering capability has been in use since MWA observing semester 2018B (July–Dec 2018), and the VCS and buffered mode triggers will become available for observing in a future semester.