Synchrotron Self-Compton Emission from External Shocks as the Origin of the Sub-TeV Emission in GRB 180720B and GRB 190114C

被引：52

作者：

Wang, Xiang-Yu ^{[1
,2
]}

Liu, Ruo-Yu ^{[3
]}

Zhang, Hai-Ming ^{[1
,2
]}

Xi, Shao-Qiang ^{[1
,2
]}

Zhang, Bing ^{[4
]}

机构：

[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China

[2] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China

[3] DESY, Platanenallee 6, D-15738 Zeuthen, Germany

[4] Univ Nevada, Dept Phys, 4505 Maryland Pkwy, Las Vegas, NV 89154 USA

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 884卷 / 02期

基金：

国家重点研发计划;

关键词：

gamma-ray burst: general; GAMMA-RAY BURSTS; AFTERGLOWS; MODEL;

D O I：

10.3847/1538-4357/ab426c

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recently, very high-energy photons above 100 GeV were reported to be detected from GRB190114C and GRB180720B at, respectively, 100?1000 s and 10 hr after the burst. We model the available broadband data of both GRBs with the synchrotron plus synchrotron self-Compton (SSC) emission of the afterglow shocks. We find that the sub-TeV emission of GRB180720B can be interpreted as the SSC emission from afterglow shocks expanding in a constant-density circumburst medium. The SSC emission of GRB190114C dominates over the synchrotron component from GeV energies at ?100s, which can explain the possible hard spectrum of the GeV emission at this time. The extrapolated flux of this SSC component to sub-TeV energies can explain the high-significance detection of GRB190114C by the MAGIC telescope. The parameter values (such as the circumburst density and shock microphysical parameters) in the modeling are not unusual for both gamma-ray bursts, implying that the detection of sub-TeV photons from these two bursts should be attributed to their large burst energies and low redshifts.

引用

页数：5

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