X-RAYING EXTENDED EMISSION AND RAPID DECAY OF SHORT GAMMA-RAY BURSTS

被引：17

作者：

Kagawa, Yasuaki ^{[1
]}

Yonetoku, Daisuke ^{[1
]}

Sawano, Tatsuya ^{[1
]}

Toyanago, Asuka ^{[1
]}

Nakamura, Takashi ^{[2
]}

Takahashi, Keitaro ^{[3
]}

Kashiyama, Kazumi ^{[4
,5
,6
]}

Ioka, Kunihito ^{[7
,8
]}

机构：

[1] Kanazawa Univ, Sch Math & Phys, Coll Sci & Engn, Kanazawa, Ishikawa 9201192, Japan

[2] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[3] Kumamoto Univ, Fac Sci, Kumamoto 8608555, Japan

[4] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[5] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Theoret Astrophys Ctr, Berkeley, CA 94720 USA

[7] KEK, Inst Particle & Nucl Studies, Ctr Theory, Tsukuba, Ibaraki 3050801, Japan

[8] SOKENDAI, Dept Particle & Nucl Phys, Tsukuba, Ibaraki 3050801, Japan

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 811卷 / 01期

关键词：

gamma-ray burst: general; gravitational waves; GRB; 130603B; NEUTRON-STARS; LIGHT CURVES; SPIN-DOWN; AFTERGLOW; MODEL; JET; MERGERS; FLARES; ENERGY;

D O I：

10.1088/0004-637X/811/1/4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Extended emission in short gamma-ray bursts (SGRBs) is a mystery. By conducting time-resolved spectral analyses of the nine brightest events observed by the Swift-XRT, we classify the early X-ray emission of SGRBs into two types. One is the extended emission with exponentially rapid decay, which shows significant spectral softening for. hundreds of seconds after the SGRB trigger and is also detected by the Swift-BAT. The other is a dim afterglow that only shows power-law decay over 10(4) s. The correlations between the temporal decay and spectral indices of the extended emissions are inconsistent with the alpha-beta correlation expected for the high-latitude curvature emission from a uniform jet. The observed too-rapid decay suggests that the emission is from a photosphere or a patchy surface, and manifests the stopping via a central engine such as magnetic reconnection at the black hole.

引用

页数：8

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