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29 March 2024
 
  » arxiv » astro-ph/0506234

 Article overview


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
AbstractWIDGET 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
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