Swift X-Ray Telescope and very large telescope observations of the afterglow of GRB 041223

被引：10

作者：

Burrows, DN

Hill, JE

Chincarini, G

Tagliaferri, G

Campana, S

Moretti, A

Romano, P

Malesani, D

Racusin, JL

Kobayashi, S

Zhang, B

Mészáros, P

O'Brien, PT

Willingale, R

Osborne, JP

Cusumano, G

Giommi, P

Angelini, L

Abbey, AF

Antonelli, LA

Beardmore, AP

Capalbi, M

Covino, S

D'Avanzo, P

Goad, MR

Kennea, JA

Morris, DC

Pagani, C

Page, KL

Stella, L

Nousek, JA

Wells, AA

Gehrels, N

机构：

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

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

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

[4] SISSA, ISAS, Int Sch Adv Studies, I-34014 Trieste, Italy

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

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

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

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

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

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

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

[12] Univ Leicester, Space Res Ctr, Leicester LE1 7RH, Leics, England

[13] INAF, Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 622卷 / 02期

基金：

美国国家航空航天局;

关键词：

gamma rays : bursts;

D O I：

10.1086/429666

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

GRB 041223 was the first gamma-ray burst detected by the Swift X-Ray Telescope (XRT), beginning 4.6 hr after the burst. The X-ray detection triggered a VLT observation of the optical/near-infrared (NIR) counterpart, located about 1.'' 1 from the XRT position. The X-ray counterpart faded rapidly, with a power-law index of -1.72 +/- 0.20, with an average unabsorbed X-ray flux of 6.5 x 10(-12) ergs cm(- 2) s(-1) in the 0.5-10 keV band for a power-law spectrum of photon index 2.02 +/- 0.13 with Galactic absorption. The NIR counterpart was observed at three epochs between 16 and 87 hr after the burst and faded with a power-law index of -1.14 +/- 0.8 with a reddening-corrected spectral energy distribution power-law slope of -0.40 +/- 0.08. We find that the X-ray and NIR data are consistent with a two-component jet in a wind medium.

引用

页码：L85 / L88

页数：4

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