A PINK update: Improvements to the CELEBI fast radio burst data reduction and analysis pipeline

TL;DR

The paper presents the PINK update to the CELEBI pipeline, enhancing fast radio burst data reduction, localization, polarimetry, and efficiency to support increased detection rates from the SKA Pathfinder.

Contribution

It introduces significant improvements to the CELEBI pipeline, including astrometry, localization, polarisation calibration, and software tools for better FRB analysis.

Findings

Enhanced astrometry improves host galaxy association.

Improved polarisation calibration yields more accurate measurements.

Pipeline efficiency and localization accuracy are significantly increased.

Abstract

Fast radio bursts (FRBs) which are well localised ($<$1") to their host galaxy are tools for studying cosmology and the intergalactic medium. Furthermore, high-time resolution datasets of their polarisation properties can enable testing of the numerous models on their potential progenitors. To that end, the CELEBI (CRAFT Effortless Localisation and Enhanced Burst Inspection) pipeline was conceived to enable data reduction from raw antenna voltages to detect fast radio transient events, localise them to sub-arcsecond precision, and produce polarimetric data at time resolutions as fine as 3 ns. Here we present a slew of updates to the CELEBI pipeline. Improvements to the astrometry correction for FRB localisations has aided our ability to determine what part of a galaxy more nearby FRBs have occurred in, which can have its own implication on the progenitor. We also have implemented time and frequency gating on detected fast transients to enable a boost to signal-to-noise, particularly useful for high dispersion measure or faint fast radio transients. We give examples of our improvements to the localisation, including for the currently 'hostless' FRB 20251019A. The polarisation calibration process has been overhauled, resulting in much more accurate measurements of derived polarisation fraction and rotation measures. Furthermore, we now have incorporated tools for structure-maximisation of the dispersion measure of fast radio transients, a software container which enables the installation of CELEBI on other machines, and improved the pipeline efficiency. Together these updates (named 'Polarisation and astrometry Improvements for New Knowledge', or PINK) greatly improve our ability to keep up with the expected detection rate from the CRAFT COherent (CRACO) upgrade to the real-time fast transient detection system of the Australian SKA Pathfinder.