In-flight performance of the IBIS calibration unit

A. J. Bird; A. Bazzano; C. Ferguson; G. La Rosa; G. Malaguti; P. Ubertini

doi:10.1051/0004-6361:20031210

Special letters issue on: first science with integral

Free Access

Issue		A&A Volume 411, Number 1, November III 2003 Special letters issue on: first science with integral


Page(s)		L197 - L201
Section		Letters
DOI		https://doi.org/10.1051/0004-6361:20031210
Published online		17 November 2003

A&A 411, L197-L201 (2003)

Letter to the Editor

In-flight performance of the IBIS calibration unit^*

A. J. Bird¹, A. Bazzano², C. Ferguson¹, G. La Rosa³, G. Malaguti⁴ and P. Ubertini²

¹ School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
² Istituto di Astrofisica Spaziale e Fisica Cosmica, IASF/CNR, Rome, Italy
³ Istituto di Astrofisica Spaziale e Fisica Cosmica, IASF/CNR, Sezione di Palermo, Palermo, Italy
⁴ Istituto di Astrofisica Spaziale e Fisica Cosmica, IASF/CNR, Sezione di Bologna, Bologna, Italy

Corresponding author: A. J. Bird, ajb@astro.soton.ac.uk

Received: 11 July 2003
Accepted: 4 August 2003

Abstract

We describe the in-flight performance of the on-board calibration unit for the IBIS telescope on INTEGRAL. Both intrinsic performance and the quality of the calibration signals provided to the IBIS detector planes are discussed. The calibration unit intrinsic performance is assessed based on the diagnostic information in IBIS housekeeping. The flux of tagged photons, i.e. those arriving at the detector planes in coincidence with a calibration strobe, is assessed from in-flight data, and analysed in conjunction with a detailed simulation. Proposed usage of the tagged photon flux is discussed, and the expected calibration accuracy derived. The effect on science data from untagged calibration unit photons is assessed based on the predicted rate and distribution of such photons.

Key words: INTEGRAL / gamma-ray / calibration

Based on observations with INTEGRAL, an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and with the participation of Russia and the USA.

© ESO, 2003

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.

In-flight performance of the IBIS calibration unit*

In-flight performance of the IBIS calibration unit^*