2026/04/12 by Liang Yi-fang, Yi-Fang Liang, Ye Li +4
Physics and Astronomy · #Connection (principal bundle) #Ellipse #Gamma-ray burst #Gamma-ray bursts and supernovae #History and Developments in Astronomy #Monte Carlo method #Pulsars and Gravitational Waves Research #Redshift #Relation (database) #Sample (material) #Term (time)
paper · pdf · doi:10.3847/1538-4357/ae84c9
openalex publication_date 2026/04/12 · openalex created_date 2026/07/25 · openalex updated_date 2026/08/05
Fast radio bursts (FRBs) and gamma-ray bursts (GRBs) are both linked to compact-object activity, yet their possible connection remains unclear. Here we perform a systematic search for spatial and temporal associations between FRBs in the second CHIME/FRB catalog and Swift GRBs. Instead of using the positional ellipses reported in the catalog, the full CHIME localization probability maps are adopted for spatial cross-matching. This yields 130 candidate pairs and increases the number of spatially consistent matches by a factor of several. Applying a distance-consistency criterion based on DM-inferred FRB redshifts and GRB distances inferred via the Amati relation reduces the sample to 37 pairs, including 26 GRB-preceding-FRB candidates (24 LGRB--FRB and 2 SGRB--FRB). Monte Carlo simulations show that the overall excess of associations is not statistically significant, and the distribution of matches across localization confidence levels is consistent with random expectations. These pairs are therefore not claimed as secure associations, but are used to constrain a possible subdominant FRB--GRB connection. These results place constraints on any FRB--GRB connection and highlight the need for improved localization and larger samples.