20 July 2010 Development of the prototype integral field unit for prompt follow-up spectroscopy of gamma-ray bursts
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We are now prototyping an integral field unit (IFU) using micro-lenses and optical fibers for a new integral field spectrograph (IFS). The IFS is one of the primary instruments of a new 3.8m telescope which is under development. We report a basic concept of the IFS and current status of the prototyping work. One of main objectives of the 3.8m telescope is prompt follow-up spectroscopy of rapidly variable astronomical objects such as gamma-ray bursts (GRBs). The IFS allows us to omit procedures of target identification and acquisition, and to start exposure very quickly. We are developing a prototype IFU for the IFS in order to establish the construction techniques. We have already finished basic design, and moved to detailed design phase. We will install the prototype IFU into an existing optical imaging spectrograph of the 188cm telescope at Okayama Astrophysical Observatory for test observations. Through the test observations, we will establish the observing procedures and the data reduction techniques. The prototype IFU has the 20 x 20 arcsec^2 field of view (FoV) and the 2 arcsec spatial sampling on the 188cm telescope. The new IFS will have the 20 x 20 arcsec^2 FoV and the 1 arcsec spatial sampling on the 3.8m telescope. The X-ray telescope of the Swift satellite distributes GRB locations with a typical accuracy of 3-5 arcsec after 70 sec from GRB triggers. The FoV of the new IFS is much wider than this localization error circle and allows us to make prompt spectroscopy of GRBs.
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Shinobu Ozaki, Ikuru Iwata, Eiji Kambe, Michitoshi Yoshida, Kiichi Okita, Fumihide Iwamuro, Hajime Sugai, Kouji Ohta, "Development of the prototype integral field unit for prompt follow-up spectroscopy of gamma-ray bursts", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773550 (20 July 2010); doi: 10.1117/12.856349; https://doi.org/10.1117/12.856349


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