Afterglows from precursors in gamma-ray bursts. Application to the optical afterglow of GRB 091024

被引：24

作者：

Nappo, F. ^{[1
,2
]}

Ghisellini, G. ^{[2
]}

Ghirlanda, G. ^{[2
]}

Melandri, A. ^{[2
]}

Nava, L. ^{[3
]}

Burlon, D. ^{[4
]}

机构：

[1] Univ Insubria, I-22100 Como, Italy

[2] INAF Osservatorio Astron Brera, I-23807 Merate, Italy

[3] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

[4] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 445卷 / 02期

关键词：

hydrodynamics; radiation mechanisms: non-thermal; gamma-ray burst: general; gamma-ray burst: individual: GRB 091024; LIGHT CURVES; EMISSION; ENERGIES; FIREBALL; MAGNETAR; SPECTRA; BRIGHT; SHOCKS; BATSE; JETS;

D O I：

10.1093/mnras/stu1832

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

About 15 per cent of gamma-ray bursts have precursors, i.e. emission episodes preceding the main event, whose spectral and temporal properties are similar to the main emission. We propose that precursors have their own fireball, producing afterglow emission due to the dissipation of the kinetic energy via external shock. In the time lapse between the precursor and the main event, we assume that the central engine is not completely turned off, but it continues to eject relativistic material at a smaller rate, whose emission is below the background level. The precursor fireball generates a first afterglow by the interaction with the external circumburst medium. Matter injected by the central engine during the 'quasi-quiescent' phase replenishes the external medium with material in relativistic motion. The fireball corresponding to the main prompt emission episode rams into this moving material, producing a second afterglow, and finally catches up and merges with the first precursor fireball. We test this scenario over GRB 091024, an event with a precursor in the prompt light curve and two well-defined bumps in the optical afterglow, obtaining an excellent agreement with the existing data.

引用

页码：1625 / 1635

页数：11

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