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Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
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A long-duration gamma-ray burst with a peculiar origin
Jun Yang1,2, Shunke Ai3,4, Bin-Bin Zhang5,6
1School of Astronomy and Space Science, Nanjing University, Nanjing, China.
Nature
|December 8, 2022
Summary
A peculiar long-duration gamma-ray burst (GRB) suggests a new origin. Observations indicate a white dwarf-neutron star merger, challenging previous GRB classification and revealing a novel progenitor.
Area of Science:
- Astrophysics and Cosmology
- High-Energy Astrophysics
- Compact Object Mergers
Background:
- Long-duration gamma-ray bursts (GRBs) are typically linked to massive star core collapse.
- Short-duration GRBs are generally associated with compact star binary mergers.
- Emerging evidence suggests 'oddball' GRBs defy simple duration-based classification, requiring multi-criteria analysis.
Purpose of the Study:
- To physically classify the peculiar long-duration gamma-ray burst GRB 211211A.
- To investigate the progenitor and emission mechanisms of GRB 211211A.
- To explore new progenitor types for gamma-ray bursts.
Main Methods:
- Analysis of prompt emission properties of GRB 211211A.
- Multiband observations (optical and near-infrared) to detect excess emission.
- Comparison with known gamma-ray burst types (Type I) and their associated phenomena (kilonovae).
Main Results:
- GRB 211211A exhibits prompt emission properties distinct from known Type I GRBs.
- Substantial optical and near-infrared excess emission, resembling kilonova emission, was detected.
- These observations suggest a non-massive star origin for GRB 211211A.
Conclusions:
- GRB 211211A's characteristics are inconsistent with typical massive star core collapse.
- A white dwarf-neutron star merger scenario with a post-merger magnetar engine provides a self-consistent explanation.
- This suggests a new progenitor channel for gamma-ray bursts, expanding our understanding of compact object mergers.
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