Urata 2010 企图观测瞬时光学辐射的巡天类地面望远镜系统WIDGET

主要内容:
The WIDeField telescope for Gamma-ray burst Early Timing (WIDGET)
说从2004年开始他们看到了10个暴同时的，还有一个是暴之前的光学事件。（我怎么没听说呢？--貌似都不明显）

精彩摘抄:

貌似是他们认为看到了光学瞬时辐射的几个暴，或者应该看到的？

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Title:		WIDGET: System Performance and GRB Prompt Optical Observations
Authors:		Urata, Yuji; Tashiro, Makoto S.; Tamagawa, Toru; Usui, Fumihiko; Kuwahara, Makoto; Lin, Hungmiao; Kageyama, Shoichi; Iwakiri, Wataru; Sugasahara, Takako; Takahara, Kazuki; Kodaka, Natsuki; Abe, Keiichi; Masuno, Keisuke; Onda, Kaori
Publication:		eprint arXiv:1010.5035
Publication Date:		10/2010
Origin:		ARXIV
Keywords:		Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Comment:		19 pages, 11 figures, Accepted to appear in PASJ
Bibliographic Code:		2010arXiv1010.5035U

Abstract

The WIDeField telescope for Gamma-ray burst Early Timing (WIDGET) is used for a fully automated, ultra-wide-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 degree x 62 degree every 10 secounds using an unfiltered system. This monitoring survey allows exploration of the 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 observation with HETE-2 is four times better than that of Swift. There has been no bright optical emission similar to that from GRB 080319B. The statistical analysis implies that GRB080319B is a rare event. This paper summarizes the design and operation of the WIDGET system and the simultaneous GRB observations obtained with this instrument.

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