Prompt and afterglow emission from the X-ray-rich GRB 981226 observed with Bepposax

被引：39

作者：

Frontera, F

Antonelli, LA

Amati, L

Montanari, E

Costa, E

Dal Fiume, D

Giommi, P

Feroci, M

Gennaro, G

Heise, J

Masetti, N

Muller, JM

Nicastro, L

Orlandini, M

Palazzi, E

Pian, E

Piro, L

Soffitta, P

Stornelli, M

in't Zand, JJM

Frail, DA

Kulkarni, SR

Vietri, M

机构：

[1] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy

[2] CNR, Ist Tecnol & Studio Radiazioni Extraterr, I-40129 Bologna, Italy

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

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

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

[6] BeppoSAX Operat Control Ctr, I-00131 Rome, Italy

[7] Space Res Org Netherlands, NL-3584 CA Utrecht, Netherlands

[8] CNR, Ist Fis Cosmica & Appl Informat, I-90146 Palermo, Italy

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

[10] CALTECH, Palomar Observ, Pasadena, CA 91125 USA

[11] Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 540卷 / 02期

关键词：

gamma rays : bursts; gamma rays : observations; shock waves; X-rays : general;

D O I：

10.1086/309369

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss observations of the prompt X- and gamma-ray emission and X-ray afterglow from GRB 981226. This event has the weakest gamma-ray peak flux detected with the BeppoSAX Gamma-Ray Burst Monitor. It shows an isolated X-ray precursor and the highest X-ray to gamma-ray fluence ratio measured thus far with the BeppoSAX Wide Field Cameras. The event was followed up with the BeppoSAX Narrow Field Instruments, and the X-ray afterglow was detected up to 10 keV. The afterglow flux is observed to rise from a level below the sensitivity of the MECS/LECS telescopes up to a peak flux of (5 +/- 1) x 10(-13) ergs cm(-2) s(-1) in the 2-10 keV energy band. This rise is followed by a decline according to a power law with an index of 1.31(-0.39)(+0.44). We discuss these results in the light of the current GRB models.

引用

页码：697 / 703

页数：7

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