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Title:
GRB 051210: Swift detection of a short gamma ray burst
Authors:
La Parola, V.; Mangano, V.; Fox, D.; Zhang, B.; Krimm, H. A.; Cusumano, G.; Mineo, T.; Burrows, D. N.; Barthelmy, S.; Campana, S.; Capalbi, M.; Chincarini, G.; Gehrels, N.; Giommi, P.; Marshall, F. E.; Mészáros, P.; Moretti, A.; O'Brien, P. T.; Palmer, D. M.; Perri, M.; Romano, P.; Tagliaferri, G.
Affiliation:
AA(INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, Italy ), AB(INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, Italy), AC(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA), AD(Department of Physics, University of Nevada, 4505 Maryland Parkway, Las Vegas, NV 89154-4002, USA), AE(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; Universities Space Research Association 10211 Wincopin Circle, Suite 500 Columbia, Maryland 21044, USA), AF(INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, Italy), AG(INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, Italy), AH(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA), AI(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA), AJ(INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate, Italy), AK(ASI Science Data Center, via Galileo Galilei, 00044 Frascati, Italy), AL(INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate, Italy ; Università degli studi di Milano-Bicocca, Dipartimento di Fisica, Piazza delle Scienze 3, 20126 Milan, Italy), AM(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA), AN(ASI Science Data Center, via Galileo Galilei, 00044 Frascati, Italy), AO(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA), AP(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA ; Department of Physics, Pennsylvania State University, PA 16802, USA), AQ(INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate, Italy), AR(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK), AS(Los Alamos National Laboratory, MS B244, NM 87545, USA), AT(ASI Science Data Center, via Galileo Galilei, 00044 Frascati, Italy), AU(INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate, Italy), AV(Universities Space Research Association 10211 Wincopin Circle, Suite 500 Columbia, Maryland 21044, USA)
Publication:
Astronomy and Astrophysics, Volume 454, Issue 3, August II 2006, pp.753-757 (A&A Homepage)
Publication Date:
08/2006
Origin:
EDP
Keywords:
gamma rays: bursts, X-rays: bursts
DOI:
10.1051/0004-6361:20065083
Bibliographic Code:
2006A&A...454..753L

Abstract

Aims.The short/hard GRB 051210 was detected and located by the Swift-BAT instrument and rapidly pointed towards by the narrow field instruments. The XRT was able to observe a bright, rapidly fading X-ray emission. We present the analysis of the prompt and afterglow emission of this event.
Methods: .The BAT spectrum is a power-law with photon index 1.0±0.3. The X-ray light curve decays with slope -2.58±0.11 and shows a small flare in the early phases. The spectrum can be described with a power law with photon index 1.54±0.16 and absorption (7.5-3.2+4.3)×1020 cm-2.
Results: .We find that the X-ray emission is consistent with the hypothesis that we are observing the curvature effect of a GRB that occurred in a low density medium, with no detectable afterglow attributable to an external shock. We estimate the density of the circumburst medium to be lower than 3×10-3 cm-3. We also discuss different hypothesis on the possible origin of the flare.

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