Temporal Analysis of GRB Precursors in the Third Swift-BAT Catalog

We select 52 long gamma-ray bursts (GRBs) that have precursor activity in the third Swift-BAT catalog. Each episode shown in both the precursors and the main bursts is fitted by the Norris function. We systematically analyze the temporal properties for both the precursors and the main bursts. We do...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2022-04, Vol.928 (2), p.152
Main Authors: Li, Liande, Mao, Jirong
Format: Article
Language:English
Subjects:
Astrophysics
Gamma ray bursts
Gamma rays
Precursors
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We select 52 long gamma-ray bursts (GRBs) that have precursor activity in the third Swift-BAT catalog. Each episode shown in both the precursors and the main bursts is fitted by the Norris function. We systematically analyze the temporal properties for both the precursors and the main bursts. We do not find any significant difference between the temporal profile of the precursor and that of the main burst. The photon count of the precursor is related to that of the main burst. It is indicated that the precursor and the main burst might have the same physical origin, as the precursor and the main burst follow the same τ p – ω relation. However, we do not find the explicit relation between the energy release of the precursor and the quiescent time. Some theoretical models, such as the fallback collapsar scenario and the jet-cocoon scenario, may be helpful to explain the GRB-precursor phenomena.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac4af2