Characterizing the dead time of the ECLAIRs camera on board the mission SVOM
Autor: | S. Bordon, A. Bajat, B. Houret, O. Godet, V. Waegebaert, S. Delaigue, C. Amoros, S. Maestre, W. Marty, P. Mandrou, R. Pons, D. Rambaud, Jean-Luc Atteia, K. Lacombe, P. Ramon, M. Galliano |
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Rok vydání: | 2018 |
Předmět: |
Physics
010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Instrumentation Astrophysics::Instrumentation and Methods for Astrophysics Astronomy Readout electronics Astronomy and Astrophysics Cdte detector Dead time 01 natural sciences On board Space and Planetary Science 0103 physical sciences Gamma-ray burst Focus (optics) 010303 astronomy & astrophysics Energy (signal processing) |
Zdroj: | Experimental Astronomy. 46:337-356 |
ISSN: | 1572-9508 0922-6435 |
DOI: | 10.1007/s10686-018-9606-1 |
Popis: | French (CNES) and Chinese (CNSA) space agencies collaborate to build the SVOM (Space-based multi-band Variable Object Monitor) mission due to be launched in 2021 to study gamma-ray bursts and high-energy transients. The SVOM prime instrument, ECLAIRs, will detect and localize GRBs autonomously as well as provide a spectral and temporal characterization of the GRB prompt emission. ECLAIRs is expected to detect around 200 GRBs during the 3 year nominal lifetime of the mission. ECLAIRs is a wide-field ( $\sim 2 \text {sr}$ ) coded mask camera with a detection plane made of 8 independent sectors of 800 Schottky CdTe detectors working in the 4-150 keV energy range. Each sector is connected to independent readout electronics. In this paper, we focus on the study of the temporal performance and we estimate how dead time will affect bright transient lightcurves. We discuss the analytical model based on simulations over a large range of source count rates on a dedicated test bench. We show that dead time will not significantly affect ECLAIRs data, even for the brightest GRBs (3.7% of lost counts for a count rate of 105 counts.s− 1 over the detection plane in the energy range 4−150 keV) and our model can nicely correct the parts of the lightcurves which are the most affected by dead time effects for very bright GRBs. |
Databáze: | OpenAIRE |
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