Swift observations of GRB 050128:: The early X-ray afterglow

被引：30

作者：

Campana, S

Antonelli, LA

Chincarini, G

Covino, S

Cusumano, G

Malesani, D

Mangano, V

Moretti, A

Pagani, C

Romano, P

Tagliaferri, G

Capalbi, M

Perri, M

Giommi, P

Angelini, L

Boyd, P

Burrows, DN

Hill, JE

Gronwall, C

Kennea, JA

Kobayashi, S

Kumar, P

Mészáros, P

Nousek, JA

Roming, PWA

Zhang, B

Abbey, AF

Beardmore, AP

Breeveld, A

Goad, MR

Godet, O

Mason, KO

Osborne, JP

Page, KL

Poole, T

Gehrels, N

机构：

[1] Osserv Astron Brera, INAF, I-23807 Merate, LC, Italy

[2] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy

[3] Univ Milan, Dipartimento Fis, I-20126 Milan, Italy

[4] INAF, Ist Astrofis Spaziale & Fis Cosm, Sez Palermo, I-90146 Palermo, Italy

[5] SISSA, ISAS, I-34014 Trieste, Italy

[6] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[7] ASI Sci Data Ctr, I-00044 Frascati, Rome, Italy

[8] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[9] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[10] Penn State Univ, Ctr Gravitat Wave Phys, University Pk, PA 16802 USA

[11] Univ Texas, Dept Astron, Austin, TX 78712 USA

[12] Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA

[13] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[14] UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 625卷 / 01期

基金：

美国国家航空航天局;

关键词：

gamma rays : bursts; X-rays : individual (GRB 050128);

D O I：

10.1086/430883

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Swift discovered GRB 050128 with the Burst Alert Telescope and promptly pointed its narrow field instruments to monitor the afterglow. X-ray observations started 108 s after the trigger time. The early decay of the afterglow is relatively flat, with a temporal decay modeled with a power-law index of similar to-0.3. A steepening occurs at later times (similar to 1500 s) with a power-law index of similar to-1.3. During this transition, the observed X- ray spectrum does not change. We interpret this behavior as either an early jet break or evidence of a transition from the fast cooling regime to the slow cooling regime in a wind environment.

引用

页码：L23 / L26

页数：4

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