The Second CHIME/FRB Catalog of Fast Radio Bursts

TL;DR

This paper presents an extensive catalog of 4539 fast radio bursts observed by CHIME, providing detailed measurements and analysis to advance understanding of FRB properties and their potential as cosmological tools.

Contribution

The catalog includes over 4500 FRBs with uniform reprocessing, improved localization, and detailed parameter measurements, enhancing previous datasets and analysis frameworks.

Findings

Confirmed the validity of previous inferences with updated measurements.

Analyzed the distribution of burst properties across the catalog.

Assessed the detection rate consistency across observational parameters.

Abstract

We present a catalog of 4539 fast radio bursts (FRBs) observed with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope between 25 July 2018 and 15 September 2023. These bursts originate from 3641 unique sources, including 981 bursts from 83 known repeating sources. For each FRB, the catalog provides a $O(10')$ estimate of sky location along with corresponding measurements of cumulative exposure time and survey sensitivity over the observing period. It includes a total-intensity dynamic spectrum between 400 and 800 MHz at 0.983 ms resolution. From this spectrum, we constrain a model of the burst morphology and measure key parameters such as arrival time, intrinsic temporal width, dispersion measure, scattering time, and flux density. This second catalog includes all FRBs from the first catalog, with every event reprocessed using a uniform and improved analysis framework. We show that previously published inferences remain valid under the updated measurements. We assess consistency of the detection rate across observational parameters, present initial distributions of burst properties, and outline ongoing and future studies that will use this catalog to investigate the nature of FRBs and their utility as astrophysical and cosmological probes.