GRB051210: Swift detection of a short gamma ray burst

V. La Parola; V. Mangano; D. Fox; B. Zhang; H. A. Krimm; G. Cusumano; T. Mineo; D. Burrows; S. Barthelmy; S. Campana; M. Capalbi; G. Chincarini; N. Gehrels; P. Giommi; F. E. Marshall; P. Meszaros; A. Moretti; P. T. O'Brien; D. M. Palmer; M. Perri; P. Romano; G. Tagliaferri

doi:10.1051/0004-6361:20065083

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GRB051210: Swift detection of a short gamma ray burst

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Abstract

The short/hard GRB051210 was detected and located by the Swift-BAT instrument and rapidly pointed towards by the narrow field instrumens. The XRT was able to observe a bright X-ray afterglow, one of the few ever observed for this class of bursts. We present the analysis of the prompt and afterglow emission of this event The BAT spectrum is a power-law with photon index 1.1 +/-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)*10^20 cm-2 We find that the X-ray emission is consistent with the hypothesis that we are observing the curvature effect of a GRB occurred in a low density medium, with no detectable afterglow. We estimate the density of the circumburst medium to be lower than 4*10^-3 cm^-3. We also discuss different hypothesis on the possible origin of the flare.

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V. La Parola, V. Mangano, D. Fox, B. Zhang, H. A. Krimm, G. Cusumano, T. Mineo, D. Burrows, S. Barthelmy, S. Campana, M. Capalbi, G. Chincarini, N. Gehrels, P. Giommi, F. E. Marshall, P. Meszaros, A. Moretti, P. T. O'Brien, D. M. Palmer, M. Perri, P. Romano, G. Tagliaferri. 2006-02-24. GRB051210: Swift detection of a short gamma ray burst. https://doi.org/10.1051/0004-6361%3A20065083

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