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WIDGET: System performance and grb prompt optical observations

机译：小部件：系统性能和grb即时光学观察

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摘要

The WIDeField telescope for Gamma-ray burst Early Timing (WIDGET) is used for a fully automated, ultrawide- field survey aimed at detecting the prompt optical emission associated with Gamma-ray Bursts (GRBs). WIDGET surveys the HETE-2 and Swift/BAT pointing directions, covering a total field of view of 62° × 62° every 10 secounds using a unfiltered system. This monitoring survey allows the exploration of optical emission before the γ-ray trigger. The unfiltered magnitude is well converted to the SDSS r' system at a 0.1 mag level. Since 2004, WIDGET has made a total of ten simultaneous and one pre-trigger GRB observations. The efficiency of synchronized observations with HETE-2 is four-times better than that of Swift. There has been no bright optical emission similar to that from GRB 080319B. A statistical analysis implies that GRB 080319B is a rare event. This paper summarizes the design and operation of the WIDGET system and the simultaneous GRB observations obtained with this instrument.
机译：WIDeField伽玛射线暴早期望远镜（WIDGET）用于全自动，超广域勘测，旨在检测与伽玛射线暴（GRB）相关的及时光发射。 WIDGET使用未经过滤的系统测量HETE-2和Swift / BAT的指向，每10秒覆盖62°×62°的总视野。该监视调查允许在γ射线触发之前探测光发射。未经过滤的幅度可以在0.1 mag的水平上很好地转换为SDSS r'系统。自2004年以来，WIDGET总共进行了10次同时触发和1次预触发GRB观测。 HETE-2同步观测的效率是Swift的四倍。没有类似于GRB 080319B的明亮光发射。统计分析表明GRB 080319B是罕见事件。本文总结了WIDGET系统的设计和操作以及使用该仪器获得的同时GRB观测值。

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