Onboard catalogue of known X-ray sources for SVOM/ECLAIRs
N. Dagoneau, S. Schanne, J. Rodriguez, J.-L. Atteia, and B. Cordier

TL;DR
This paper presents an onboard catalogue of known X-ray sources for the SVOM/ECLAIRs mission, crucial for distinguishing new transient sources from known ones to improve detection accuracy.
Contribution
It introduces a structured onboard source catalogue based on Swift/BAT and MAXI/GSC data, and analyzes its impact on background noise and source detection in ECLAIRs.
Findings
Source contribution varies with sky position, energy band, and exposure time.
Cleaning known sources reduces noise and false triggers.
Catalogue structure supports effective source disentanglement.
Abstract
The SVOM mission under development will carry various instruments, and in particular the coded-mask telescope ECLAIRs, with a large field of view of about 2 sr, operating in the 4--150 keV energy band, whose goal is to detect high energy transients such as gamma-ray bursts. The trigger software onboard ECLAIRs will search for new hard X-ray sources appearing in the sky, as well as peculiar behaviour (e.g. strong outbursts) from known sources, in order to repoint the satellite to perform follow-up observations with its onboard narrow field of view instruments. The presence of known X-ray sources must be disentangled from the appearance of new sources. This is done with the help of an onboard source catalogue, which we present in this paper. As an input we use catalogues of X-ray sources detected by Swift/BAT and MAXI/GSC and we study the influence of the sources on ECLAIRs' background…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Astrophysics and Cosmic Phenomena · Astrophysical Phenomena and Observations
