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Proceedings Paper

Optical telescope BIRT in ORIGIN for gamma ray burst observing
Author(s): Robert Content; Ray Sharples; Mathew J. Page; Richard Cole; David M. Walton; Berend Winter; Kristian Pedersen; Jens Hjorth; Michael Andersen; Allan Hornstrup; Jan-Willem A. den Herder; Luigi Piro
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Paper Abstract

The ORIGIN concept is a space mission with a gamma ray, an X-ray and an optical telescope to observe the gamma ray bursts at large Z to determine the composition and density of the intergalactic matter in the line of sight. It was an answer to the ESA M3 call for proposal. The optical telescope is a 0.7-m F/1 with a very small instrument box containing 3 instruments: a slitless spectrograph with a resolution of 20, a multi-imager giving images of a field in 4 bands simultaneously, and a cross-dispersed Échelle spectrograph giving a resolution of 1000. The wavelength range is 0.5 μm to 1.7 μm. All instruments fit together in a box of 80 mm x 80 mm x 200 mm. The low resolution spectrograph uses a very compact design including a special triplet. It contains only spherical surfaces except for one tilted cylindrical surface to disperse the light. To reduce the need for a high precision pointing, an Advanced Image Slicer was added in front of the high resolution spectrograph. This spectrograph uses a simple design with only one mirror for the collimator and another for the camera. The Imager contains dichroics to separate the bandwidths and glass thicknesses to compensate the differences in path length. All 3 instruments use the same 2k x 2k detector simultaneously so that telescope pointing and tip-tilt control of a fold mirror permit to place the gamma ray burst on the desired instrument without any other mechanism.

Paper Details

Date Published: 21 September 2012
PDF: 8 pages
Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84424E (21 September 2012); doi: 10.1117/12.926656
Show Author Affiliations
Robert Content, Australian Astronomical Observatory (Australia)
Durham Univ. (United Kingdom)
Ray Sharples, Durham Univ. (United Kingdom)
Mathew J. Page, Univ. College London (United Kingdom)
Richard Cole, Univ. College London (United Kingdom)
David M. Walton, Univ. College London (United Kingdom)
Berend Winter, Univ. College London (United Kingdom)
Kristian Pedersen, Univ. of Copenhagen (Denmark)
Jens Hjorth, Univ. of Copenhagen (Denmark)
Michael Andersen, Univ. of Copenhagen (Denmark)
Allan Hornstrup, DTU Space (Denmark)
Jan-Willem A. den Herder, SRON Netherlands Institute for Space Research (Netherlands)
Luigi Piro, INAF - IASF Roma (Italy)

Published in SPIE Proceedings Vol. 8442:
Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
Mark C. Clampin; Giovanni G. Fazio; Howard A. MacEwen; Jacobus M. Oschmann, Editor(s)

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