Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A

M. R. Goad; G. Tagliaferri; K. L. Page; A. Moretti; J. P. Osborne; S. Kobayashi; P. Kumar; P. I. Mészáros; G. Chincarini; T. Sakamoto; B. Zhang; S. D. Barthelmy; A. P. Beardmore; D. N. Burrows; S. Campana; M. Capalbi; L. Cominsky; G. Cusumano; N. Gehrels; P. Giommi; O. Godet; J. E. Hill; J. A. Kennea; H. Krimm; V. La Parola; V. Mangano; T. Mineo; D. C. Morris; K. Mukerjee; J. A. Nousek; P. T. O'Brien; C. Pagani; M. Perri; P. Romano; A. A. Wells

doi:10.1051/0004-6361:20054457

Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A

M. R. Goad, G. Tagliaferri, K. L. Page, A. Moretti, J. P. Osborne, S. Kobayashi, P. Kumar, P. I. Mészáros, G. Chincarini, T. Sakamoto, B. Zhang, S. D. Barthelmy, A. P. Beardmore, D. N. Burrows, S. Campana, M. Capalbi, L. Cominsky, G. Cusumano, N. Gehrels, P. GiommiO. Godet, J. E. Hill, J. A. Kennea, H. Krimm, V. La Parola, V. Mangano, T. Mineo, D. C. Morris, K. Mukerjee, J. A. Nousek, P. T. O'Brien, C. Pagani, M. Perri, P. Romano, A. A. Wells

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Abstract

We report on the temporal and spectral characteristics of the early X-ray emission from the Gamma Ray Bursts GRB050126 and GRB050219A as observed by Swift. The X-ray light-curves of these 2 bursts both show remarkably steep early decays (F(t) ∝ t^-3), breaking to flatter slopes on timescales of a few hundred seconds. For GRB050126 the burst shows no evidence of spectral evolution in the 20-150 keV band, and the spectral index of the γ-ray and X-ray afterglows are significantly different suggesting a separate origin. By contrast the BAT spectrum of GRB050219A displays significant spectral evolution, becoming softer at later times, with Γ evolving toward the XRT photon index seen in the early X-ray afterglow phase. For both bursts, the 0.2-10 keV spectral index pre- and post-break in the X-ray decay light-curve are consistent with no spectral evolution, We suggest that the steep early decline in the X-ray decay light-curve is either the curvature tail of the prompt emission; X-ray flaring activity; or external forward shock emission from a jet with high density regions of small angular size (>Γ^-1). The late slope we associate with the forward external shock.

Original language	English (US)
Pages (from-to)	89-100
Number of pages	12
Journal	Astronomy and Astrophysics
Volume	449
Issue number	1
DOIs	https://doi.org/10.1051/0004-6361:20054457
State	Published - Apr 2006

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361:20054457

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Goad, M. R., Tagliaferri, G., Page, K. L., Moretti, A., Osborne, J. P., Kobayashi, S., Kumar, P., Mészáros, P. I., Chincarini, G., Sakamoto, T., Zhang, B., Barthelmy, S. D., Beardmore, A. P., Burrows, D. N., Campana, S., Capalbi, M., Cominsky, L., Cusumano, G., Gehrels, N., ... Wells, A. A. (2006). Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A. Astronomy and Astrophysics, 449(1), 89-100. https://doi.org/10.1051/0004-6361:20054457

@article{74271db360284f9389dea4bc67d6a62a,

title = "Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A",

abstract = "We report on the temporal and spectral characteristics of the early X-ray emission from the Gamma Ray Bursts GRB050126 and GRB050219A as observed by Swift. The X-ray light-curves of these 2 bursts both show remarkably steep early decays (F(t) ∝ t-3), breaking to flatter slopes on timescales of a few hundred seconds. For GRB050126 the burst shows no evidence of spectral evolution in the 20-150 keV band, and the spectral index of the γ-ray and X-ray afterglows are significantly different suggesting a separate origin. By contrast the BAT spectrum of GRB050219A displays significant spectral evolution, becoming softer at later times, with Γ evolving toward the XRT photon index seen in the early X-ray afterglow phase. For both bursts, the 0.2-10 keV spectral index pre- and post-break in the X-ray decay light-curve are consistent with no spectral evolution, We suggest that the steep early decline in the X-ray decay light-curve is either the curvature tail of the prompt emission; X-ray flaring activity; or external forward shock emission from a jet with high density regions of small angular size (>Γ-1). The late slope we associate with the forward external shock.",

author = "Goad, {M. R.} and G. Tagliaferri and Page, {K. L.} and A. Moretti and Osborne, {J. P.} and S. Kobayashi and P. Kumar and M{\'e}sz{\'a}ros, {P. I.} and G. Chincarini and T. Sakamoto and B. Zhang and Barthelmy, {S. D.} and Beardmore, {A. P.} and Burrows, {D. N.} and S. Campana and M. Capalbi and L. Cominsky and G. Cusumano and N. Gehrels and P. Giommi and O. Godet and Hill, {J. E.} and Kennea, {J. A.} and H. Krimm and {La Parola}, V. and V. Mangano and T. Mineo and Morris, {D. C.} and K. Mukerjee and Nousek, {J. A.} and O'Brien, {P. T.} and C. Pagani and M. Perri and P. Romano and Wells, {A. A.}",

year = "2006",

month = apr,

doi = "10.1051/0004-6361:20054457",

language = "English (US)",

volume = "449",

pages = "89--100",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "1",

}

Goad, MR, Tagliaferri, G, Page, KL, Moretti, A, Osborne, JP, Kobayashi, S, Kumar, P, Mészáros, PI, Chincarini, G, Sakamoto, T, Zhang, B, Barthelmy, SD, Beardmore, AP, Burrows, DN, Campana, S, Capalbi, M, Cominsky, L, Cusumano, G, Gehrels, N, Giommi, P, Godet, O, Hill, JE, Kennea, JA, Krimm, H, La Parola, V, Mangano, V, Mineo, T, Morris, DC, Mukerjee, K, Nousek, JA, O'Brien, PT, Pagani, C, Perri, M, Romano, P & Wells, AA 2006, 'Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A', Astronomy and Astrophysics, vol. 449, no. 1, pp. 89-100. https://doi.org/10.1051/0004-6361:20054457

TY - JOUR

T1 - Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A

AU - Goad, M. R.

AU - Tagliaferri, G.

AU - Page, K. L.

AU - Moretti, A.

AU - Osborne, J. P.

AU - Kobayashi, S.

AU - Kumar, P.

AU - Mészáros, P. I.

AU - Chincarini, G.

AU - Sakamoto, T.

AU - Zhang, B.

AU - Barthelmy, S. D.

AU - Beardmore, A. P.

AU - Burrows, D. N.

AU - Campana, S.

AU - Capalbi, M.

AU - Cominsky, L.

AU - Cusumano, G.

AU - Gehrels, N.

AU - Giommi, P.

AU - Godet, O.

AU - Hill, J. E.

AU - Kennea, J. A.

AU - Krimm, H.

AU - La Parola, V.

AU - Mangano, V.

AU - Mineo, T.

AU - Morris, D. C.

AU - Mukerjee, K.

AU - Nousek, J. A.

AU - O'Brien, P. T.

AU - Pagani, C.

AU - Perri, M.

AU - Romano, P.

AU - Wells, A. A.

PY - 2006/4

Y1 - 2006/4

N2 - We report on the temporal and spectral characteristics of the early X-ray emission from the Gamma Ray Bursts GRB050126 and GRB050219A as observed by Swift. The X-ray light-curves of these 2 bursts both show remarkably steep early decays (F(t) ∝ t-3), breaking to flatter slopes on timescales of a few hundred seconds. For GRB050126 the burst shows no evidence of spectral evolution in the 20-150 keV band, and the spectral index of the γ-ray and X-ray afterglows are significantly different suggesting a separate origin. By contrast the BAT spectrum of GRB050219A displays significant spectral evolution, becoming softer at later times, with Γ evolving toward the XRT photon index seen in the early X-ray afterglow phase. For both bursts, the 0.2-10 keV spectral index pre- and post-break in the X-ray decay light-curve are consistent with no spectral evolution, We suggest that the steep early decline in the X-ray decay light-curve is either the curvature tail of the prompt emission; X-ray flaring activity; or external forward shock emission from a jet with high density regions of small angular size (>Γ-1). The late slope we associate with the forward external shock.

AB - We report on the temporal and spectral characteristics of the early X-ray emission from the Gamma Ray Bursts GRB050126 and GRB050219A as observed by Swift. The X-ray light-curves of these 2 bursts both show remarkably steep early decays (F(t) ∝ t-3), breaking to flatter slopes on timescales of a few hundred seconds. For GRB050126 the burst shows no evidence of spectral evolution in the 20-150 keV band, and the spectral index of the γ-ray and X-ray afterglows are significantly different suggesting a separate origin. By contrast the BAT spectrum of GRB050219A displays significant spectral evolution, becoming softer at later times, with Γ evolving toward the XRT photon index seen in the early X-ray afterglow phase. For both bursts, the 0.2-10 keV spectral index pre- and post-break in the X-ray decay light-curve are consistent with no spectral evolution, We suggest that the steep early decline in the X-ray decay light-curve is either the curvature tail of the prompt emission; X-ray flaring activity; or external forward shock emission from a jet with high density regions of small angular size (>Γ-1). The late slope we associate with the forward external shock.

UR - http://www.scopus.com/inward/record.url?scp=33645661150&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33645661150&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:20054457

DO - 10.1051/0004-6361:20054457

M3 - Article

AN - SCOPUS:33645661150

SN - 0004-6361

VL - 449

SP - 89

EP - 100

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 1

ER -

Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A

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