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Proceedings Paper

Auxiliary instruments for the absolute calibration of the ASTRI SST-2M prototype for the Cherenkov Telescope Array
Author(s): Maria Concetta Maccarone; Alberto Segreto; Osvaldo Catalano; Giovanni La Rosa; Francesco Russo; Giuseppe Sottile; Carmelo Gargano; Benedetto Biondo; Mauro Fiorini; Salvatore Incorvaia; Giorgio Toso
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Paper Abstract

ASTRI SST-2M is the end-to-end prototype telescope under development by the Italian National Institute of Astrophysics, INAF, proposed for the investigation of the highest-energy gamma-ray band in the framework of the Cherenkov Telescope Array, CTA. The ASTRI SST-2M prototype will be installed in Italy at the INAF station located at Serra La Nave on Mount Etna during Fall 2014. The calibration and scientific validation phase will start soon after. The calibration of a Cherenkov telescope includes several items and tools. The ASTRI SST- 2M camera is equipped with an internal fiber illumination system that allows to perform the relative calibration through monitoring of gain and efficiency variations of each pixel. The absolute calibration of the overall system, including optics, will take advantage from auxiliary instrumentation, namely UVscope and UVSiPM, two small-aperture multi-pixels photon detectors NIST calibrated in lab. During commissioning phase, to measure the main features of ASTRI SST-2M, as its overall spectral response, the main telescope and the auxiliary UVscope-UVSiPM will be illuminated simultaneously by a spatially uniform flux generated by a ground-based light source, named Illuminator, placed at a distance of few hundreds meters. Periodically, during clear nights, the flux profiles of a reference star tracked simultaneously by ASTRI SST-2M and UVscope-UVSiPM will allow to evaluate the total atmospheric attenuation and the absolute calibration constant of the ASTRI SST-2M prototype. In this contribution we describe the auxiliary UVscope-UVSiPM and Illuminator sub-system together with an overview of the end-to-end calibration procedure foreseen for the ASTRI SST-2M telescope prototype.

Paper Details

Date Published: 6 August 2014
PDF: 9 pages
Proc. SPIE 9149, Observatory Operations: Strategies, Processes, and Systems V, 914918 (6 August 2014); doi: 10.1117/12.2054526
Show Author Affiliations
Maria Concetta Maccarone, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (Italy)
Alberto Segreto, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (Italy)
Osvaldo Catalano, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (Italy)
Giovanni La Rosa, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (Italy)
Francesco Russo, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (Italy)
Giuseppe Sottile, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (Italy)
Carmelo Gargano, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (Italy)
Benedetto Biondo, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (Italy)
Mauro Fiorini, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano (Italy)
Salvatore Incorvaia, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano (Italy)
Giorgio Toso, INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano (Italy)


Published in SPIE Proceedings Vol. 9149:
Observatory Operations: Strategies, Processes, and Systems V
Alison B. Peck; Chris R. Benn; Robert L. Seaman, Editor(s)

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