Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/18783
 Title: GRB 051210: Swift detection of a short gamma ray burst Authors: La Parola VMangano, V.Cusumano, G.Mineo, T.Fox, D.Burrows, D. N.Mészáros, P.Zhang, B.Krimm, H. A.Barthelmy, S.Gehrels, N.Marshall, F. E.Krimm, H. A.Tagliaferri, G.Campana, S.Chincarini, G.Moretti, A.Romano, P.Capalbi, M.Giommi, P.Perri, M.Chincarini, G.Mészáros, P.O'Brien, P. T.Palmer, D. M. First Published: Aug-2006 Publisher: EDP Sciences for European Southern Observatory (ESO) Citation: Astronomy & Astrophysics, 2006, 454 (3), pp. 753-757 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 $1.0\pm0.3$. The X-ray light curve decays with slope $-2.58\pm0.11$ and shows a small flare in the early phases. The spectrum can be described with a power law with photon index $1.54\pm0.16$ and absorption $(7.5_{-3.2}^{+4.3})\times10^{20}$ 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 $3\times10^{-3}$ cm-3. We also discuss different hypothesis on the possible origin of the flare. DOI Link: 10.1051/0004-6361:20065083 ISSN: 0004-6361 eISSN: 1432-0746 Links: http://hdl.handle.net/2381/18783http://www.aanda.org/articles/aa/abs/2006/30/aa5083-06/aa5083-06.html Version: Publisher Version Status: Peer-reviewed Type: Journal Article Rights: Copyright © 2006 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO. Appears in Collections: Published Articles, Dept. of Physics and Astronomy

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