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29 March 2024 |
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The search for optical emission on and before the GRB trigger with the WIDGET telescope | T. Tamagawa
; F. Usui
; Y. Urata
; K. Abe
; K. Onda
; M. Tashiro
; Y. Terada
; H. Fujiwara
; N. Miura
; S. Hirose
; N. Kawai
; A. Yoshida
; M. Mori
; K. Makishima
; | Date: |
10 Jun 2005 | Subject: | astro-ph | Abstract: | WIDGET is a robotic telescope for monitoring the HETE-2 field-of-view to detect Gamma-ray Burst optical flashes or possible optical precursors. The system has 62degx62deg wide field-of-view which covers about 80% of HETE-2 one with a 2kx2k Apogee U10 CCD camera and a Canon EF 24mm f/1.4 wide-angle lens without a bandpass filter. WIDGET has been in operation since June 2004 at Akeno observing site where is about 200 km apart from Tokyo. Typical limiting magnitude with S/N=3 at the site is V=10mag for 5 seconds exposure and V=11mag for 30 seconds exposure. We had already six coincident observations with HETE-2 position alerts. It was, however, cloudy for all cases due to rainy season in Japan. Expected number of coincident observations under clear sky is about 5 events per year. We will extend the system in early 2005 for Swift era to monitor optical transients in wider field-of-view, multi-color or polarization modes. | Source: | arXiv, astro-ph/0506234 | Services: | Forum | Review | PDF | Favorites |
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