X-ray flares from late internal and late external shocks
Abstract
We analyze several recently detected gamma-ray bursts GRBs with late X-ray flares in the context of late internal shock and late external shock models We find that the X-ray flares in GRB 050421 and GRB 050502B originate from late internal shocks while the main X-ray flares in GRB 050406 and GRB 050607 may arise from late external shocks Under the assumption that the central engine has two periods of activities we get four basic types of X-ray light curves The classification of these types depends on which period of activities produces the prompt gamma-ray emission Type 1 and Type 2 the earlier period Type 3 and Type 4 the late period and on whether the late ejecta catching up with the early ejecta happens earlier than the deceleration of the early ejecta Type 1 and Type 3 or not Type 2 and Type 4 We find that the X-ray flare caused by a late external shock is a special case of Type 1 Our analysis reveals that the X-ray light curves of GRBs 050406 050421 and 050607 can be classified as Type 1 while the X-ray light curve of GRB 050502B is classified as Type 2 However the X-ray light curve of GRB 050406 is also likely to be Type 2 We also predict a long-lag short-lived X-ray flare caused by the inner external shock which forms when a low baryon-loading long-lag late ejecta decelerates in the non-relativistic tail of an outer external shock driven by an early ejecta
- Publication:
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36th COSPAR Scientific Assembly
- Pub Date:
- 2006
- DOI:
- 10.48550/arXiv.astro-ph/0512555
- arXiv:
- arXiv:astro-ph/0512555
- Bibcode:
- 2006cosp...36..731W
- Keywords:
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- Astrophysics
- E-Print:
- 15 pages, 4 figures, ApJ submitted