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
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
收藏
页码:L85 / L88
页数:4
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