The unusual X-ray light curve of GRB 080307: The onset of the afterglow?

K. L. Page; R. Willingale; P. T. O'Brien; N. R. Tanvir; J. P. Osborne; B. Zhang; S. T. Holland; A. J. Levan; A. Melandri; R. L.C. Starling; D. Bersier; D. N. Burrows; J. E. Geach; P. Maxted

doi:10.1111/j.1365-2966.2009.14509.x

The unusual X-ray light curve of GRB 080307: The onset of the afterglow?

K. L. Page, R. Willingale, P. T. O'Brien, N. R. Tanvir, J. P. Osborne, B. Zhang, S. T. Holland, A. J. Levan, A. Melandri, R. L.C. Starling, D. Bersier, D. N. Burrows, J. E. Geach, P. Maxted

Astronomy & Astrophysics

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Abstract

Swift-detected GRB 080307 showed an unusual smooth rise in its X-ray light curve around 100 s after the burst, at the start of which the emission briefly softened. This 'hump' has a longer duration than is normal for a flare at early times and does not demonstrate a typical flare profile. Using a two-component power-law-to-exponential model, the rising emission can be modelled as the onset of the afterglow, something which is very rarely seen in Swift-X-ray light curves. We cannot, however, rule out that the hump is a particularly slow early-time flare, or that it is caused by upscattered reverse shock electrons.

Original language	English (US)
Pages (from-to)	328-334
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	395
Issue number	1
DOIs	https://doi.org/10.1111/j.1365-2966.2009.14509.x
State	Published - May 2009

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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Page, K. L., Willingale, R., O'Brien, P. T., Tanvir, N. R., Osborne, J. P., Zhang, B., Holland, S. T., Levan, A. J., Melandri, A., Starling, R. L. C., Bersier, D., Burrows, D. N., Geach, J. E., & Maxted, P. (2009). The unusual X-ray light curve of GRB 080307: The onset of the afterglow? Monthly Notices of the Royal Astronomical Society, 395(1), 328-334. https://doi.org/10.1111/j.1365-2966.2009.14509.x

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title = "The unusual X-ray light curve of GRB 080307: The onset of the afterglow?",

abstract = "Swift-detected GRB 080307 showed an unusual smooth rise in its X-ray light curve around 100 s after the burst, at the start of which the emission briefly softened. This 'hump' has a longer duration than is normal for a flare at early times and does not demonstrate a typical flare profile. Using a two-component power-law-to-exponential model, the rising emission can be modelled as the onset of the afterglow, something which is very rarely seen in Swift-X-ray light curves. We cannot, however, rule out that the hump is a particularly slow early-time flare, or that it is caused by upscattered reverse shock electrons.",

author = "Page, {K. L.} and R. Willingale and O'Brien, {P. T.} and Tanvir, {N. R.} and Osborne, {J. P.} and B. Zhang and Holland, {S. T.} and Levan, {A. J.} and A. Melandri and Starling, {R. L.C.} and D. Bersier and Burrows, {D. N.} and Geach, {J. E.} and P. Maxted",

year = "2009",

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doi = "10.1111/j.1365-2966.2009.14509.x",

language = "English (US)",

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journal = "Monthly Notices of the Royal Astronomical Society",

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Page, KL, Willingale, R, O'Brien, PT, Tanvir, NR, Osborne, JP, Zhang, B, Holland, ST, Levan, AJ, Melandri, A, Starling, RLC, Bersier, D, Burrows, DN, Geach, JE & Maxted, P 2009, 'The unusual X-ray light curve of GRB 080307: The onset of the afterglow?', Monthly Notices of the Royal Astronomical Society, vol. 395, no. 1, pp. 328-334. https://doi.org/10.1111/j.1365-2966.2009.14509.x

TY - JOUR

T1 - The unusual X-ray light curve of GRB 080307

T2 - The onset of the afterglow?

AU - Page, K. L.

AU - Willingale, R.

AU - O'Brien, P. T.

AU - Tanvir, N. R.

AU - Osborne, J. P.

AU - Zhang, B.

AU - Holland, S. T.

AU - Levan, A. J.

AU - Melandri, A.

AU - Starling, R. L.C.

AU - Bersier, D.

AU - Burrows, D. N.

AU - Geach, J. E.

AU - Maxted, P.

PY - 2009/5

Y1 - 2009/5

N2 - Swift-detected GRB 080307 showed an unusual smooth rise in its X-ray light curve around 100 s after the burst, at the start of which the emission briefly softened. This 'hump' has a longer duration than is normal for a flare at early times and does not demonstrate a typical flare profile. Using a two-component power-law-to-exponential model, the rising emission can be modelled as the onset of the afterglow, something which is very rarely seen in Swift-X-ray light curves. We cannot, however, rule out that the hump is a particularly slow early-time flare, or that it is caused by upscattered reverse shock electrons.

AB - Swift-detected GRB 080307 showed an unusual smooth rise in its X-ray light curve around 100 s after the burst, at the start of which the emission briefly softened. This 'hump' has a longer duration than is normal for a flare at early times and does not demonstrate a typical flare profile. Using a two-component power-law-to-exponential model, the rising emission can be modelled as the onset of the afterglow, something which is very rarely seen in Swift-X-ray light curves. We cannot, however, rule out that the hump is a particularly slow early-time flare, or that it is caused by upscattered reverse shock electrons.

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The unusual X-ray light curve of GRB 080307: The onset of the afterglow?

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