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Titolo: Observation of contemporaneous optical radiation from a gamma-ray burst
Autore: Akerlof, C; Balsano, R; Barthelmy, S; Bloch, J; Butterworth, P; Casperson, D; Cline, T; Fletcher, S; Frontera, F; Gisler, G; Heise, J; Hills, J; Kehoe, R; Lee, B; Marshall, S; McKay, T; Miller, R; Piro, L; Priedhorsky, W; Szymanski, J; Wren, J;
- Indirizzi:
- Univ Michigan, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 iv Michigan, Ann Arbor, MI 48109 USA Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA Univ Calif Los Alamos Natl Lab Los Alamos NM USA 87545 amos, NM 87545 USA NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA NASA Greenbelt MDUSA 20771 ard Space Flight Ctr, Greenbelt, MD 20771 USA Univ Space Res Assoc, Seabrook, MD 20706 USA Univ Space Res Assoc Seabrook MD USA 20706 Assoc, Seabrook, MD 20706 USA Raytheon Syst, Lanham, MD 20706 USA Raytheon Syst Lanham MD USA 20706Raytheon Syst, Lanham, MD 20706 USA Univ Ferrara, I-44100 Ferrara, Italy Univ Ferrara Ferrara Italy I-44100Univ Ferrara, I-44100 Ferrara, Italy Space Res Org, Utrecht, Netherlands Space Res Org Utrecht NetherlandsSpace Res Org, Utrecht, Netherlands Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA Univ CalifLawrence Livermore Natl Lab Livermore CA USA 94550 A 94550 USA Inst Astrofis Spaziale, Rome, Italy Inst Astrofis Spaziale Rome ItalyInst Astrofis Spaziale, Rome, Italy
- Titolo Testata:
- NATURE
fascicolo: 6726,
volume: 398,
anno: 1999,
pagine: 400 - 402
- SICI:
- 0028-0836(19990401)398:6726<400:OOCORF>2.0.ZU;2-7
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- AFTERGLOW;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Agriculture,Biology & Environmental Sciences
- Life Sciences
- Physical, Chemical & Earth Sciences
- Citazioni:
- 33
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Akerlof, C Univ Michigan, Ann Arbor, MI 48109 USA Univ Michigan Ann ArborMI USA 48109 , Ann Arbor, MI 48109 USA
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- Citazione:
- C. Akerlof et al., "Observation of contemporaneous optical radiation from a gamma-ray burst", NATURE, 398(6726), 1999, pp. 400-402
Abstract
The origin of gamma-ray bursts (GRBs) has been enigmatic since their discovery(1). The situation improved dramatically in 1997, when the rapid availability of precise coordinates(2,3) for the bursts allowed the detection of faint optical and radio afterglows-optical spectra thus obtained have demonstrated conclusively that the bursts occur at cosmological distances. But, despite efforts by several groups(4-7), optical detection has not hitherto been achieved during the brief duration of a burst. Here we report the detection of bright optical emission from GRB990123 while the burst was still in progress. Our observations begin 22 seconds after the onset of the burst and show an increase in brightness by a factor of 14 during the first 25 seconds; the brightness then declines by a factor of 100, at which point (700seconds after the burst onset) it falls below our detection threshold. Theredshift of this burst, z approximate to 1.6 (refs 8, 9), implies a peak optical luminosity of 5 x 10(49) erg s(-1) Optical emission from gamma-ray bursts has been generally thought to take place at the shock fronts generated by interaction of the primary energy source with the surrounding medium, where the gamma-rays might also be produced The lack of a significant change in the gamma-ray light curve when the optical emission develops suggests that the gamma-rays are not produced at the shock front, but closer to the site of the original explosion(10).
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Documento generato il 26/05/13 alle ore 03:11:26