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Title:
Swift Observations of the X-Ray-Bright GRB 050315
Authors:
Vaughan, S.; Goad, M. R.; Beardmore, A. P.; O'Brien, P. T.; Osborne, J. P.; Page, K. L.; Barthelmy, S. D.; Burrows, D. N.; Campana, S.; Cannizzo, J. K.; Capalbi, M.; Chincarini, G.; Cummings, J. R.; Cusumano, G.; Giommi, P.; Godet, O.; Hill, J. E.; Kobayashi, S.; Kumar, P.; La Parola, V.; Levan, A.; Mangano, V.; Mészáros, P.; Moretti, A.; Morris, D. C.; Nousek, J. A.; Pagani, C.; Palmer, D. M.; Racusin, J. L.; Romano, P.; Tagliaferri, G.; Zhang, B.; Gehrels, N.
Affiliation:
AA(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.), AB(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.), AC(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.), AD(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.), AE(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.), AF(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.), AG(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AH(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802.), AI(INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy.), AJ(NASA Goddard Space Flight Center, Greenbelt, MD 20771.; Joint Center for Astrophysics, University of Maryland, Baltimore County, Baltimore, MD 21250.), AK(ASI Science Data Center, Via Galileo Galilei, I-00044 Frascati (Rome), Italy.), AL(INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy.; Universitá degli studi di Milano-Bicocca, Dipartimento di Fisica, Piazza delle Scienze 3, I-20126 Milan, Italy.), AM(NASA Goddard Space Flight Center, Greenbelt, MD 20771.; National Research Council, 2101 Constitution Avenue, NW, Washington, DC 20418.), AN(INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Sezione di Palermo, Via Ugo La Malfa 153, I-90146 Palermo, Italy.), AO(ASI Science Data Center, Via Galileo Galilei, I-00044 Frascati (Rome), Italy.), AP(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.), AQ(NASA Goddard Space Flight Center, Greenbelt, MD 20771.; Universities Space Research Association, 10211 Wincopin Circle, Suite 500, Columbia, MD, 21044-3432.), AR(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802.), AS(Department of Astronomy, University of Texas, Austin, TX 78712.), AT(INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Sezione di Palermo, Via Ugo La Malfa 153, I-90146 Palermo, Italy.), AU(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.), AV(INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Sezione di Palermo, Via Ugo La Malfa 153, I-90146 Palermo, Italy.), AW(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802.), AX(INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy.), AY(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802.), AZ(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802.), BA(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802.; INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy.), BB(Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545.), BC(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802.), BD(INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy.), BE(INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy.), BF(Department of Physics, University of Nevada, Box 454002, Las Vegas, NV 89154-4002.), BG(NASA Goddard Space Flight Center, Greenbelt, MD 20771.)
Publication:
The Astrophysical Journal, Volume 638, Issue 2, pp. 920-929. (ApJ Homepage)
Publication Date:
02/2006
Origin:
UCP
ApJ Keywords:
Gamma Rays: Bursts, X-rays: individual (GRB 050315)
DOI:
10.1086/499069
Bibliographic Code:
2006ApJ...638..920V

Abstract

This paper discusses Swift observations of the γ-ray burst GRB 050315 (z=1.949) from 80 s to 10 days after the onset of the burst. The X-ray light curve displayed a steep early decay (t-5) for ~200 s and several breaks. However, both the prompt hard X-ray/γ-ray emission (observed by the BAT) and the first ~300 s of X-ray emission (observed by the XRT) can be explained by exponential decays, with similar decay constants. Extrapolating the BAT light curve into the XRT band suggests that the rapidly decaying, early X-ray emission was simply a continuation of the fading prompt emission; this strong similarity between the prompt γ-ray and early X-ray emission may be related to the simple temporal and spectral character of this X-ray-rich GRB. The prompt (BAT) spectrum was steep down to ~15 keV and appeared to continue through the XRT bandpass, implying a low peak energy, inconsistent with the Amati relation. Following the initial steep decline, the X-ray afterglow did not fade for ~1.2×104 s, after which time it decayed with a temporal index of α~0.7, followed by a second break at ~2.5×105 s to a slope of α~2. The apparent ``plateau'' in the X-ray light curve, after the early rapid decay, makes this one of the most extreme examples of the steep-flat-steep X-ray light curves revealed by Swift. If the second afterglow break is identified with a jet break, then the jet opening angle was θ0~5deg, implying Eγ>~1050 ergs.
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