Swift XRT observations of the breaking X-ray afterglow of GRB 050318

M. Perri; P. Giommi; M. Capalbi; L. Amati; F. Frontera; G. Chincarini; S. Campana; A. Moretti; P. Romano; G. Tagliaferri; G. Cusumano; V. La Parola; V. Mangano; T. Mineo; D. N. Burrows; J. E. Hill; J. A. Kennea; D. C. Morris; C. Pagani; J. A. Nousek; L. Angelini; N. Gehrels; M. Still; A. P. Beardmore; M. R. Goad; O. Godet; P. T. O'Brien; J. P. Osborne; K. L. Page

doi:10.1051/0004-6361:200500173

Swift XRT observations of the breaking X-ray afterglow of GRB 050318

M. Perri, P. Giommi, M. Capalbi, L. Amati, F. Frontera, G. Chincarini, S. Campana, A. Moretti, P. Romano, G. Tagliaferri, G. Cusumano, V. La Parola, V. Mangano, T. Mineo, D. N. Burrows, J. E. Hill, J. A. Kennea, D. C. Morris, C. Pagani, J. A. NousekL. Angelini, N. Gehrels, M. Still, A. P. Beardmore, M. R. Goad, O. Godet, P. T. O'Brien, J. P. Osborne, K. L. Page

Astronomy & Astrophysics

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Abstract

We report the results of Swift X-Ray Telescope (XRT) observations of GRB 050318. This event triggered the Burst Alert Telescope (BAT) aboard Swift and was followed-up with XRT and UVOT for 11 consecutive orbits starting from 54 min after the trigger. A previously unknown fading X-ray source was detected and accurately monitored. The source was found to decrease in intensity with time and a clear temporal break occurring at ∼18000 s after the trigger was observed. The X-ray light curve was found to be consistent with a broken power-law with decay indices -1.17 ±0.08 and -2.10_-0.24 ^+0.22 before and after the break. The spectrum of the X-ray afterglow was well described by a photoelectrically absorbed power-law with energy index of -1.09 ± 0.09. No evidence of spectral evolution was found. We compare these results with those obtained with UVOT and separately reported and refine the data analysis of BAT. We discuss our results in the framework of a collimated fireball model and a synchrotron radiation emission mechanism. Assuming the GRB redshift derived from the farthest optical absorption complex (z = 1.44), the event is fully consistent with the E_P-_Eiso correlation.

Original language	English (US)
Pages (from-to)	L1-L5
Journal	Astronomy and Astrophysics
Volume	442
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:200500173
State	Published - Nov 2005

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361:200500173

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Perri, M., Giommi, P., Capalbi, M., Amati, L., Frontera, F., Chincarini, G., Campana, S., Moretti, A., Romano, P., Tagliaferri, G., Cusumano, G., La Parola, V., Mangano, V., Mineo, T., Burrows, D. N., Hill, J. E., Kennea, J. A., Morris, D. C., Pagani, C., ... Page, K. L. (2005). Swift XRT observations of the breaking X-ray afterglow of GRB 050318. Astronomy and Astrophysics, 442(2), L1-L5. https://doi.org/10.1051/0004-6361:200500173

@article{eba215c4779c4bc4ad3032e3bf93267e,

title = "Swift XRT observations of the breaking X-ray afterglow of GRB 050318",

abstract = "We report the results of Swift X-Ray Telescope (XRT) observations of GRB 050318. This event triggered the Burst Alert Telescope (BAT) aboard Swift and was followed-up with XRT and UVOT for 11 consecutive orbits starting from 54 min after the trigger. A previously unknown fading X-ray source was detected and accurately monitored. The source was found to decrease in intensity with time and a clear temporal break occurring at ∼18000 s after the trigger was observed. The X-ray light curve was found to be consistent with a broken power-law with decay indices -1.17 ±0.08 and -2.10-0.24 +0.22 before and after the break. The spectrum of the X-ray afterglow was well described by a photoelectrically absorbed power-law with energy index of -1.09 ± 0.09. No evidence of spectral evolution was found. We compare these results with those obtained with UVOT and separately reported and refine the data analysis of BAT. We discuss our results in the framework of a collimated fireball model and a synchrotron radiation emission mechanism. Assuming the GRB redshift derived from the farthest optical absorption complex (z = 1.44), the event is fully consistent with the EP-Eiso correlation.",

author = "M. Perri and P. Giommi and M. Capalbi and L. Amati and F. Frontera and G. Chincarini and S. Campana and A. Moretti and P. Romano and G. Tagliaferri and G. Cusumano and {La Parola}, V. and V. Mangano and T. Mineo and Burrows, {D. N.} and Hill, {J. E.} and Kennea, {J. A.} and Morris, {D. C.} and C. Pagani and Nousek, {J. A.} and L. Angelini and N. Gehrels and M. Still and Beardmore, {A. P.} and Goad, {M. R.} and O. Godet and O'Brien, {P. T.} and Osborne, {J. P.} and Page, {K. L.}",

year = "2005",

month = nov,

doi = "10.1051/0004-6361:200500173",

language = "English (US)",

volume = "442",

pages = "L1--L5",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "2",

}

Perri, M, Giommi, P, Capalbi, M, Amati, L, Frontera, F, Chincarini, G, Campana, S, Moretti, A, Romano, P, Tagliaferri, G, Cusumano, G, La Parola, V, Mangano, V, Mineo, T, Burrows, DN, Hill, JE, Kennea, JA, Morris, DC, Pagani, C, Nousek, JA, Angelini, L, Gehrels, N, Still, M, Beardmore, AP, Goad, MR, Godet, O, O'Brien, PT, Osborne, JP & Page, KL 2005, 'Swift XRT observations of the breaking X-ray afterglow of GRB 050318', Astronomy and Astrophysics, vol. 442, no. 2, pp. L1-L5. https://doi.org/10.1051/0004-6361:200500173

TY - JOUR

T1 - Swift XRT observations of the breaking X-ray afterglow of GRB 050318

AU - Perri, M.

AU - Giommi, P.

AU - Capalbi, M.

AU - Amati, L.

AU - Frontera, F.

AU - Chincarini, G.

AU - Campana, S.

AU - Moretti, A.

AU - Romano, P.

AU - Tagliaferri, G.

AU - Cusumano, G.

AU - La Parola, V.

AU - Mangano, V.

AU - Mineo, T.

AU - Burrows, D. N.

AU - Hill, J. E.

AU - Kennea, J. A.

AU - Morris, D. C.

AU - Pagani, C.

AU - Nousek, J. A.

AU - Angelini, L.

AU - Gehrels, N.

AU - Still, M.

AU - Beardmore, A. P.

AU - Goad, M. R.

AU - Godet, O.

AU - O'Brien, P. T.

AU - Osborne, J. P.

AU - Page, K. L.

PY - 2005/11

Y1 - 2005/11

N2 - We report the results of Swift X-Ray Telescope (XRT) observations of GRB 050318. This event triggered the Burst Alert Telescope (BAT) aboard Swift and was followed-up with XRT and UVOT for 11 consecutive orbits starting from 54 min after the trigger. A previously unknown fading X-ray source was detected and accurately monitored. The source was found to decrease in intensity with time and a clear temporal break occurring at ∼18000 s after the trigger was observed. The X-ray light curve was found to be consistent with a broken power-law with decay indices -1.17 ±0.08 and -2.10-0.24 +0.22 before and after the break. The spectrum of the X-ray afterglow was well described by a photoelectrically absorbed power-law with energy index of -1.09 ± 0.09. No evidence of spectral evolution was found. We compare these results with those obtained with UVOT and separately reported and refine the data analysis of BAT. We discuss our results in the framework of a collimated fireball model and a synchrotron radiation emission mechanism. Assuming the GRB redshift derived from the farthest optical absorption complex (z = 1.44), the event is fully consistent with the EP-Eiso correlation.

AB - We report the results of Swift X-Ray Telescope (XRT) observations of GRB 050318. This event triggered the Burst Alert Telescope (BAT) aboard Swift and was followed-up with XRT and UVOT for 11 consecutive orbits starting from 54 min after the trigger. A previously unknown fading X-ray source was detected and accurately monitored. The source was found to decrease in intensity with time and a clear temporal break occurring at ∼18000 s after the trigger was observed. The X-ray light curve was found to be consistent with a broken power-law with decay indices -1.17 ±0.08 and -2.10-0.24 +0.22 before and after the break. The spectrum of the X-ray afterglow was well described by a photoelectrically absorbed power-law with energy index of -1.09 ± 0.09. No evidence of spectral evolution was found. We compare these results with those obtained with UVOT and separately reported and refine the data analysis of BAT. We discuss our results in the framework of a collimated fireball model and a synchrotron radiation emission mechanism. Assuming the GRB redshift derived from the farthest optical absorption complex (z = 1.44), the event is fully consistent with the EP-Eiso correlation.

UR - http://www.scopus.com/inward/record.url?scp=27144494276&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=27144494276&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:200500173

DO - 10.1051/0004-6361:200500173

M3 - Article

AN - SCOPUS:27144494276

SN - 0004-6361

VL - 442

SP - L1-L5

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -

Swift XRT observations of the breaking X-ray afterglow of GRB 050318

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