Taylor & Francis Group
Browse
PoissonFOCuS_SM.pdf (456.01 kB)

Poisson-FOCuS: An Efficient Online Method for Detecting Count Bursts with Application to Gamma Ray Burst Detection

Download (456.01 kB)
journal contribution
posted on 2023-09-06, 17:39 authored by Kes Ward, Giuseppe Dilillo, Idris Eckley, Paul Fearnhead

Gamma ray bursts are flashes of light from distant, new-born black holes. CubeSats that monitor high-energy photons across different energy bands are used to detect these bursts. There is a need for computationally efficient algorithms, able to run using the limited computational resource onboard a CubeSats, that can detect when gamma ray bursts occur. Current algorithms are based on monitoring photon counts across a grid of different sizes of time window. We propose a new method, which extends the recently proposed FOCuS approach for online change detection to Poisson data. Our method is mathematically equivalent to searching over all possible window sizes, but at half the computational cost of the current grid-based methods. We demonstrate the additional power of our approach using simulations and data drawn from the Fermi gamma ray burst monitor archive. Supplementary materials for this article are available online.

Funding

This work was supported by the EPSRC grants EP/N031938/1 and EP/R004935/1, and BT as part of the Next Generation Converged Digital Infrastructure (NG-CDI) Prosperity Partnership. We also acknowledge the support of the INAF RSN-5 mini-grant 1.05.12.04.05 “Development of novel algorithms for detecting high-energy transient events in astronomical time series”.

History