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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50949

    Title: WIDGET: System Performance and GRB Prompt Optical Observations
    Authors: Urata,Y;Tashiro,MS;Tamagawa,T;Usui,F;Kuwahara,M;Lin,HM;Kageyama,S;Iwakiri,W;Sugasahara,T;Takahara,K;Kodaka,N;Abe,K;Masuno,K;Onda,K
    Contributors: 天文研究所
    Date: 2011
    Issue Date: 2012-03-27 18:13:29 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 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 x 62 every 10 secounds using a unfiltered system. This monitoring survey allows the exploration of optical emission before the gamma-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.
    Appears in Collections:[天文研究所] 期刊論文

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