Troja 2007 GRB 051109B的观测

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astro-ph/0701855 [abs, ps, pdf, other] :

Title: Swift Observations of GRB 051109B
Authors: E. Troja, G. Cusumano, V. LaParola, V.Mangano, T. Mineo (INAF - IASFPA)
Comments: 2 pages, 1 figure. Proceedings of "SWIFT and GRBs: Unveiling the Relativistic Universe" June 5-9, 2006 Venice (Italy)

We present Swift observations of GRB 051109B, a soft long burst triggered by the Burst Alert Telescope (BAT). The soft photon index of the prompt emission suggest it is a X-ray Flash (XRF) or, at least, a X-ray Rich (XRR) burst. The X-ray lightcurve displays the canonical shape of many other GRBs, a double b roken power law with a small flare superimposed at ~T_0+1500 s, and its extrapolation to early times smoothly joins with the BAT lightcurve. On the basis of the derived optical to X-ray flux ratio, it cannot be classified as a dark burst.