GRB 050822: Detailed analysis of an XRF observed by Swift

Details GRB 050822: Detailed analysis of an XRF observed by Swift GRB 050822: Detailed analysis of an XRF observed by Swift

2007-02-09

arxiv.org/abs/astro-ph/0702262v2

Astronomy and Astrophysics

Astrophysics

Now accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20077266

We report on the temporal and spectral characteristics of the early X-ray emission from the GRB 050822 as observed by Swift. This burst is likely to be an XRF showing major X-ray flares in its XRT light-curve. The quality of the data allows a detailed spectral analysis of the early afterglow in the X-ray band. During the X-ray flares, a positive correlation between the count rate and the spectral hardness (i.e. the higher the count rate, the harder the spectrum) is clearly seen for the X-ray flares. This behaviour, similar to that seen for Gamma-ray pulses, indicates that the energy peak of the spectrum is in the XRT energy band and it moves towards lower energies with time. We show evidence for the possible detection of the emergence of the forward-shock emission, produced at a radius larger than 4x10^16 cm in the case of a CBM afterglow model (a formation region clearly different from that producing the prompt emission). Finally, we show that the null detection of a jet break up to T_0 + 4x10^6 s in the X-ray light curve of this XRF can be understood: i) if the jet seen on-axis is uniform with a large opening angle theta > 20 degrees); or ii) if the jet is a structured Gaussian-like jet with the line-of-sight outside the bright Gaussian core.

Affiliated with

Also associated with

No associations

Rating

GRB 050822: Detailed analysis of an XRF observed by Swift does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with GRB 050822: Detailed analysis of an XRF observed by Swift, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GRB 050822: Detailed analysis of an XRF observed by Swift will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-7895