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

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

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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10.1111/j.1365-2966.2009.14509.x

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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

@article{8ad3358403414872b60b42c21b0001da,

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",

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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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