Swift Observations of GRB 051109B

Details Swift Observations of GRB 051109B Swift Observations of GRB 051109B

2007-01-30

arxiv.org/abs/astro-ph/0701855v1

Nuovo Cim.B121:1599-1600,2006

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure. Proceedings of "SWIFT and GRBs: Unveiling the Relativistic Universe" June 5-9, 2006 Venice (Italy)

Scientific paper

10.1393/ncb/i2007-10324-8

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.

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