A comprehensive study of GRB 070125, a most energetic gamma-ray burst

被引：76

作者：

Chandra, Poonam ^{[1
]}

Cenko, S. Bradley ^{[2
]}

Frail, Dale A. ^{[3
]}

Chevalier, Roger A. ^{[1
]}

Macquart, Jean-Pierre ^{[4
]}

Kulkarni, Shri R. ^{[4
]}

Bock, Douglas C-J. ^{[5
]}

Bertoldi, Frank ^{[6
]}

Kasliwal, Mansi ^{[4
]}

Fox, Derek B. ^{[7
]}

Price, Paul A. ^{[8
]}

Berger, Edo ^{[9
,10
]}

Soderberg, Alicia M. ^{[9
,10
]}

Harrison, Fiona A. ^{[2
]}

Gal-Yam, Avishay ^{[11
]}

Ofek, Eran O. ^{[4
]}

Rau, Arne ^{[4
]}

Schmidt, Brian P. ^{[12
]}

Cameron, P. Brian ^{[4
]}

Cowie, Lennox L. ^{[8
]}

Cowie, Antoinette ^{[8
]}

Roth, Katherine C. ^{[13
]}

Dopita, Michael ^{[14
]}

Peterson, Bruce ^{[14
]}

Penprase, Bryan E. ^{[15
]}

机构：

[1] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

[2] CALTECH, Space Radiat Lab, Pasadena, CA 91125 USA

[3] Natl Radio Astron Observ, Socorro, NM 87801 USA

[4] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

[5] Combined Array Res Millimeter Wave Astron, Big Pine, CA 93513 USA

[6] Argelander Inst Astron, D-53121 Bonn, Germany

[7] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[8] Univ Hawaii, Astron Inst, Honolulu, HI 96822 USA

[9] Princeton Univ Observ, Princeton, NJ 08544 USA

[10] Carnegie Inst Washington Observ, Pasadena, CA 91101 USA

[11] Weizmann Inst Sci, Benoziyo Ctr Astrophys, IL-76100 Rehovot, Israel

[12] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia

[13] Gemini Observ, Hilo, HI 96720 USA

[14] Australian Natl Univ, Inst Adv Studies, Weston, ACT 2611, Australia

[15] Pomona Coll, Dept Phys & Astron, Claremont, CA 91711 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 683卷 / 02期

关键词：

gamma rays : bursts; gamma rays : observations; radiation mechanisms : general techniques; radar astronomy; X-rays : bursts;

D O I：

10.1086/589807

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a comprehensive multiwavelength analysis of the bright, long-duration gamma-ray burst GRB 070125, comprised of observations in gamma-ray, X-ray, optical, millimeter, and centimeter wave bands. Simultaneous fits to the optical and X-ray light curves favor a break on day 3.78, which we interpret as the jet break from a collimated outflow. Independent fits to optical and X-ray bands give similar results in the optical bands but shift the jet break to around day 10 in the X-ray light curve. We show that for the physical parameters derived for GRB 070125, inverse Compton scattering effects are important throughout the afterglow evolution. While inverse Compton scattering does not affect radio and optical bands, it may be a promising candidate to delay the jet break in the X-ray band. Radio light curves show rapid flux variations, which are interpreted as due to interstellar scintillation and used to derive an upper limit of 2: 4; 1017 cm on the radius of the fireball in the lateral expansion phase of the jet. Radio light curves and spectra suggest a high synchrotron self-absorption frequency indicative of the afterglow shock wave moving in a dense medium. Our broadband modeling favors a constant density profile for the circumburst medium over a windlike profile (R-2). However, keeping in mind the uncertainty of the parameters, it is difficult to unambiguously distinguish between the two density profiles. Our broadband fits suggest that GRB 070125 is a burst with high radiative efficiency (>60%).

引用

页码：924 / 942

页数：19

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