The optical/IR counterpart of the 1998 July 3 gamma-ray burst and its evolution

被引：35

作者：

Castro-Tirado, AJ

Zapatero-Osorio, MR

Gorosabel, J

Griner, J

Heidt, J

Herranz, D

Kemp, SN

Martínez-González, E

Oscoz, A

Ortega, V

Röser, HJ

Wolf, C

Pedersen, H

Jaunsen, AO

Korhonen, H

Ilyin, I

Duemmler, R

Andersen, MI

Hjorth, J

Henden, AA

Vrba, FJ

Fried, JW

Frontera, F

Nicastro, L

机构：

[1] Lab Astrofis Espacial & Fis Fundamental, INTA, E-28080 Madrid, Spain

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

[3] Inst Astrofis Canarias, E-38200 La Laguna, Spain

[4] Astrophys Inst Potsdam, D-14482 Potsdam, Germany

[5] Landessternwarte Heidelberg, D-69117 Heidelberg, Germany

[6] CSIC, UC, Inst Fis Cantabria, Santander, Spain

[7] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[8] Copenhagen Astron Observ, DK-2100 Copenhagen, Denmark

[9] Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway

[10] Nord Opt Telescope, La Palma, Spain

[11] Univ Oulu, Astron Div, FIN-90571 Oulu, Finland

[12] Nord Inst Theoret Phys, DK-2100 Copenhagen, Denmark

[13] USN Observ, USRA, Flagstaff Stn, Flagstaff, AZ 86002 USA

[14] CNR, Ist Tecnol & Studio Radiaz Extraterr, I-40129 Bologna, Italy

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

[16] CNR, Ist Fis Cosm & Applicaz Informat, I-90146 Palermo, Italy

来源：

ASTROPHYSICAL JOURNAL | 1999年 / 511卷 / 02期

基金：

美国国家科学基金会;

关键词：

cosmology : observations; gamma rays : bursts;

D O I：

10.1086/311846

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We imaged the X-ray error box of GRB 980703, beginning 22.5 hr after the gamma-ray event, in both the optical R and near-infrared H bands. A fading optical/IR object was detected within the X-ray error box, coincident with the variable radio source reported by Frail et al. in 1998, who also detected the optical transient independently of us. Further imagery revealed the gamma-ray burst (GRB) host galaxy, with R = 22.49 +/- 0.04 and H = 20.5 +/- 0.25, the brightest so far detected. When excluding its contribution to the total flux, both the R- and H-band light curves are well fit by a power-law decay with index alpha similar or equal to 1.4. Our data suggest an intrinsic column density in the host galaxy of similar to 3.5 x 10(21) cm(-2), which indicates the existence of a dense and gas-rich medium in which the GRB occurred, thus supporting the hypernova model scenarios.

引用

页码：L85 / L88

页数：4

共 32 条

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