WIDGET: System Performance and GRB Prompt Optical Observations

Autor:	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
Rok vydání:	2010
Předmět:	Astrophysics - Instrumentation and Methods for Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics Astrophysics - High Energy Astrophysical Phenomena
Druh dokumentu:	Working Paper
DOI:	10.1093/pasj/63.1.137
Popis:	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. Comment: 19 pages, 11 figures, Accepted to appear in PASJ
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1010.5035 Zobrazit plný text záznamu View this record from Arxiv