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Simulating raw data for SVOM/ECLAIRs Camera

Explore the challenges and solutions in simulating raw data for the SVOM/ECLAIRs Camera to detect transient sources efficiently, including GRBs, with low energy coverage up to 4 keV. Learn about simulating background and GRB events, optimizing trigger algorithms, and future perspectives.

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Simulating raw data for SVOM/ECLAIRs Camera

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  1. Simulating raw data for SVOM/ECLAIRs Camera Sujay Mate PhD Student IRAP/ UniversitÉ de Toulouse III Supervisors : Laurent Bouchet, Jean-Luc Atteia

  2. The ECLAIRs Instrument • Primary instrument on board of SVOM • Large field of view X-ray / soft gamma ray coded mask imaging telescope • Primary objective : Prompt detection and localization of transient sources, especially GRBs, at various timescales (10 ms to 20 min). • Key challenge – Low energy coverage up to 4 keV. Important for the detection of high redshift GRBs and faint/soft nearby GRBs. CNES, CEA, IRAP, APC Cosmic Explosions 2019

  3. The GRB Detection Challenge Crab Rise Crab Set HETE – 2 background variation Atteia et al. (2003) AIP Conf. Proc. 662, 17 Cosmic Explosions 2019

  4. The GRB detection in ECLAIRs • Onboard – UGTS, count rate and image trigger (Nicolas’ talk) • Information (time, energy, position) about all the photons will be transmitted to the ground. • The ground trigger will search for transients and GRBs in the data • The ground trigger is necessary for multiple reasons, • Technical reasons might force temporary shut down of onboard trigger. • Onboard the computation power is limited and the GRB search algorithms are brute force. • Adjust the onboard trigger parameter based on ground analysis (e.g. long term background variations). • It is important to have a dynamic simulation of background as well as GRB + X-ray source events in order to test, design and develop trigger algorithms. Cosmic Explosions 2019

  5. Expected Background and its estimation • The Cosmic X-ray Background (CXB) photons • Reflection of CXB from the Earth’s atmosphere (Reflection) • Hard X-rays from the Earth’s atmosphere (Albedo) • Charged particles in the South Atlantic Anomaly (SAA) • Cosmic rays • Particle albedo • Instrument/satellite body activation (Cumani et al 2019) Cosmic Explosions 2019

  6. Expected Background and its estimation • Ray-tracing (computationally fast, but not possible to take into account all the physical processes) • Monte-Carlo simulations of particle-matter interactions using toolkits such as GEANT4 (accurate, but computationally slow) • We have developed a method which is based on the reusing of the photon interactions stored in a large GEANT4 output database. • Gain of 103-104 in terms of computation time. • Allows dynamical simulation. • Instrument independent. Cosmic Explosions 2019

  7. ECLAIRs Background Simulation Mate et al. in prep. Cosmic Explosions 2019

  8. X-ray Sources And GRBs • X-ray source Simulations : • Using a catalogue constructed from ASM/RXTE (for low E) and Swift/BAT (for high E) sky surveys (N. Dagoneau). • GRB Simulations : • Using a GRB database constructed from Swift/BAT, Fermi/GBM, HETE2/Fregate and CGRO/BATSE detected GRBs extrapolated in ECLAIRs energy range (F. Daigne et al.). • At present, ray-tracing simulations (APC Paris) are used but there is possibility to use GEANT4 simulations for better accuracy. 50 relatively bright and low variability sources in ECLAIRs in Galactic Coordinates Cosmic Explosions 2019

  9. Simulation of Raw data GRB 050904 Crab Rise Image Crab Set Single events / 4 -120 keV Cosmic Explosions 2019

  10. Simulation of Raw data GRB Deconvolution Crab Cosmic Explosions 2019

  11. Future Work and Perspectives • Making current raw data simulations more realistic (Add other background components e.g. cosmic rays, variability of sources and GEANT4 simulations for source and GRBs) • Using the raw data : • Test the onboard trigger software. • To design and develop algorithms for the ground trigger. • To test data reduction softwares developed for the ECLAIRs. • Extended Studies • Study of the sensitivity of ECLAIRs for GRBs as well as other types of transients (tidal disruption events, X-ray flashes, soft gamma-ray repeaters, terrestrial gamma ray flashes etc) • Study of the impact of different pointing strategies on the sensitivity. • Extend the tool to GRM (Gamma-ray Monitor on board of SVOM) and study the synergy between ECLAIRs and GRM. Cosmic Explosions 2019

  12. Thank You

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