Optical and NIR observations of the afterglow of GRB020813

被引：38

作者：

Covino, S

Malesani, D

Tavecchio, F

Antonelli, LA

Arkharov, A

Di Paola, A

Fugazza, D

Ghisellini, G

Larionov, V

Lazzati, D

Mannucci, F

Masetti, N

Barrena, R

Benetti, S

Castro-Tirado, AJ

Alighieri, SD

Fiore, F

Frontera, F

Fruchter, A

Ghinassi, F

Gladders, M

Hall, PB

Israel, GL

Klose, S

Magazzù, A

Palazzi, E

Pedani, M

Pian, E

Romano, P

Stefanon, M

Stella, L

机构：

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

[2] Osserv Astron Roma, INAF, I-00136 Rome, Italy

[3] Cent Astron Observ Pulkovo, St Petersburg 196140, Russia

[4] Telescopio Nazl Galileo, INAF, Santa Cruz De La Palma 38700, Spain

[5] St Petersburg Univ, St Petersburg 198504, Russia

[6] Isaac Newton Inst Chile, St Petersburg Branch, St Petersburg, Russia

[7] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[8] CNR, Inst Radioastron, I-50125 Florence, Italy

[9] Ist Astrofis Spaziale & Fis Cosm, I-40129 Bologna, Italy

[10] Osserv Astron Padova, INAF, I-35122 Padua, Italy

[11] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain

[12] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy

[13] Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy

[14] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[15] Carnegie Observ, Pasadena, CA 91101 USA

[16] Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago 22, Chile

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

[18] Osserv Astron Trieste, INAF, I-34131 Trieste, Italy

[19] Thuringer Landessternwarte Tautenburg, Karl Schwarzschild Observ, D-07778 Tautenburg, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2003年 / 404卷 / 01期

关键词：

gamma rays : bursts; radiation mechanisms : non-thermal; GAMMA-RAY BURST; LIGHT CURVES; EMISSION; SPECTRA;

D O I：

10.1051/0004-6361:20030525

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present optical and near-infrared (NIR) photometry of the bright afterglow of GRB020813. Our data span from 3 hours to 4 days after the GRB event. A rather sharp achromatic break is present in the light curve, 14 hours after the trigger. In the framework of jetted fireballs, this break corresponds to a jet half-opening angle of 1.9degrees +/- 0.2degrees, the smallest value ever inferred for a GRB. We discuss our results in the framework of currently available models, and find that they have problems in explaining the joint temporal and spectral properties, and in particular the slow decay before the break.

引用

页码：L5 / L9

页数：5

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