GRB 990510: On the possibility of a beamed X-ray afterglow

被引：32

作者：

Kuulkers, E

Antonelli, LA

Kuiper, L

Kaastra, JS

Amati, L

Costa, E

Frontera, F

Heise, J

In't Zand, JJM

Masetti, N

Nicastro, L

Pian, E

Piro, L

Soffitta, P

机构：

[1] SRON, NL-3584 CA Utrecht, Netherlands

[2] Univ Utrecht, Inst Astron, NL-3508 TA Utrecht, Netherlands

[3] BeppoSAX Sci Data Ctr, I-00131 Rome, Italy

[4] Osserv Astron Roma, I-00044 Frascati, Italy

[5] CNR, Ist Tecnol & Studio Radiazioni Extraterrestri, I-40129 Bologna, Italy

[6] CNR, Ist Astrofis Spaziale, I-00133 Rome, Italy

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

[8] CNR, Ist Fis Cosm & Applicazioni Informat, I-90146 Palermo, Italy

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 538卷 / 02期

关键词：

gamma rays : bursts; X-rays : general;

D O I：

10.1086/309159

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss the prompt emission of the gamma-ray burst GRB 990510 and its subsequent X-ray afterglow from 8.0 to 44.3 hr after the prompt emission, using observations with the Gamma-Ray Burst Monitor and Narrow Field Instruments on BeppoSAX. In the 40-700 keV band, GRB 990510 had a fluence of similar to 1.9 x 10(-5) ergs cm(-2), whereas it reached a peak flux of similar to 2.4 x 10(-6) ergs cm(-2) s(-1). The X-ray after-glow decay light curve can be satisfactorily described by a single power law with an index of -1.42 +/- 0.07. Both the X-ray and optical behavior of the afterglow can be explained by gamma-ray burst debris expanding as a jet; we find that the cooling frequency is (fixed) between the optical and X-ray wavelength bands.

引用

页码：638 / 644

页数：7

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