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Related Experiment Video

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Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

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Gamma-ray burst theory after Swift.

Tsvi Piran¹, Yi-Zhong Fan

¹The Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel. tsvi@phys.huji.ac.il

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|February 13, 2007

Summary

Early Swift observations of gamma-ray bursts (GRBs) revealed surprising early afterglow light curves, challenging the established relativistic blast wave model and collapsar origin theories for long GRBs.

Area of Science:

Astrophysics
High-energy astrophysics
Cosmic explosions

Background:

Pre-Swift afterglow observations largely supported the relativistic blast wave model for gamma-ray bursts (GRBs).
Host galaxy properties and association with Type Ic supernovae led to the collapsar model for long GRBs.
Most afterglow data was collected hours after the initial burst event.

Purpose of the Study:

To review how early broadband afterglow light curve observations by the Swift satellite are changing our understanding of gamma-ray bursts.
To highlight the discrepancies between anticipated smooth transitions from prompt emission to afterglow and observed early light curve behaviors.

Main Methods:

Utilizing real-time slew capabilities of Swift's X-ray telescope and UV/optical telescope.

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Recording and analyzing early broadband afterglow light curves of gamma-ray bursts.

Comparing early observational data with predictions from the relativistic blast wave and collapsar models.

Main Results:

Swift's rapid-response observations revealed early afterglow light curves significantly different from expectations.
Early X-ray observations, in particular, yielded unexpected results.
The transition from prompt emission to afterglow was not as smooth as previously anticipated.

Conclusions:

Early afterglow observations by Swift challenge the established models for gamma-ray bursts.
The data suggests a more complex scenario for GRB emission mechanisms and origins.
These findings necessitate a revision of our understanding of gamma-ray burst physics.