AN ACHROMATIC BREAK IN THE AFTERGLOW OF THE SHORT GRB 140903A: EVIDENCE FOR A NARROW JET

E. Troja; T. Sakamoto; S. B. Cenko; A. Lien; N. Gehrels; A. J. Castro-tirado; R. Ricci; J. Capone; V. Toy; A. Kutyrev; N. Kawai; A. Cucchiara; A. Fruchter; J. Gorosabel; S. Jeong; A. Levan; D. Perley; R. Sanchez-ramirez; N. Tanvir; S. Veilleux

doi:10.3847/0004-637x/827/2/102

AN ACHROMATIC BREAK IN THE AFTERGLOW OF THE SHORT GRB 140903A: EVIDENCE FOR A NARROW JET

E. Troja, T. Sakamoto, S. B. Cenko, A. Lien, N. Gehrels, A. J. Castro-tirado, R. Ricci, J. Capone, V. Toy, A. Kutyrev, N. Kawai, A. Cucchiara, A. Fruchter, J. Gorosabel, S. Jeong, A. Levan, D. Perley, R. Sanchez-ramirez, N. Tanvir, S. Veilleux

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56 Citations (Scopus)

Abstract

We report the results of our observing campaign on GRB 140903A, a nearby (z = 0.351) short-duration (T₉₀ ∼ 0.3 s) gamma-ray burst discovered by Swift. We monitored the X-ray afterglow with Chandra up to 15 days after the burst and detected a steeper decay of the X-ray flux after t_j ≈ 1 day. Continued monitoring at optical and radio wavelengths showed a similar decay in flux at nearly the same time, and we interpret it as evidence of a narrowly collimated jet. By using the standard fireball model to describe the afterglow evolution, we derive a jet opening angle θ_j ≈ 5° and a collimation-corrected total energy release E ≈ 2 × 10⁵⁰ erg. We further discuss the nature of the GRB progenitor system. Three main lines disfavor a massive star progenitor: the properties of the prompt gamma-ray emission, the age and low star formation rate of the host galaxy, and the lack of a bright supernova. We conclude that this event likely originated from a compact binary merger.

Original language	English
Article number	102
Journal	Astrophysical Journal
Volume	827
Issue number	2
ISSN	0004-637X
DOIs	https://doi.org/10.3847/0004-637x/827/2/102
Publication status	Published - 20 Aug 2016

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Troja, E., Sakamoto, T., Cenko, S. B., Lien, A., Gehrels, N., Castro-tirado, A. J., Ricci, R., Capone, J., Toy, V., Kutyrev, A., Kawai, N., Cucchiara, A., Fruchter, A., Gorosabel, J., Jeong, S., Levan, A., Perley, D., Sanchez-ramirez, R., Tanvir, N., & Veilleux, S. (2016). AN ACHROMATIC BREAK IN THE AFTERGLOW OF THE SHORT GRB 140903A: EVIDENCE FOR A NARROW JET. Astrophysical Journal, 827(2), [102]. https://doi.org/10.3847/0004-637x/827/2/102

Troja, E, Sakamoto, T, Cenko, SB, Lien, A, Gehrels, N, Castro-tirado, AJ, Ricci, R, Capone, J, Toy, V, Kutyrev, A, Kawai, N, Cucchiara, A, Fruchter, A, Gorosabel, J, Jeong, S, Levan, A, Perley, D, Sanchez-ramirez, R, Tanvir, N & Veilleux, S 2016, 'AN ACHROMATIC BREAK IN THE AFTERGLOW OF THE SHORT GRB 140903A: EVIDENCE FOR A NARROW JET', Astrophysical Journal, vol. 827, no. 2, 102. https://doi.org/10.3847/0004-637x/827/2/102

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title = "AN ACHROMATIC BREAK IN THE AFTERGLOW OF THE SHORT GRB 140903A: EVIDENCE FOR A NARROW JET",

abstract = "We report the results of our observing campaign on GRB 140903A, a nearby (z = 0.351) short-duration (T90 ∼ 0.3 s) gamma-ray burst discovered by Swift. We monitored the X-ray afterglow with Chandra up to 15 days after the burst and detected a steeper decay of the X-ray flux after tj ≈ 1 day. Continued monitoring at optical and radio wavelengths showed a similar decay in flux at nearly the same time, and we interpret it as evidence of a narrowly collimated jet. By using the standard fireball model to describe the afterglow evolution, we derive a jet opening angle θj ≈ 5° and a collimation-corrected total energy release E ≈ 2 × 1050 erg. We further discuss the nature of the GRB progenitor system. Three main lines disfavor a massive star progenitor: the properties of the prompt gamma-ray emission, the age and low star formation rate of the host galaxy, and the lack of a bright supernova. We conclude that this event likely originated from a compact binary merger.",

author = "E. Troja and T. Sakamoto and Cenko, {S. B.} and A. Lien and N. Gehrels and Castro-tirado, {A. J.} and R. Ricci and J. Capone and V. Toy and A. Kutyrev and N. Kawai and A. Cucchiara and A. Fruchter and J. Gorosabel and S. Jeong and A. Levan and D. Perley and R. Sanchez-ramirez and N. Tanvir and S. Veilleux",

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T1 - AN ACHROMATIC BREAK IN THE AFTERGLOW OF THE SHORT GRB 140903A

T2 - EVIDENCE FOR A NARROW JET

AU - Troja, E.

AU - Sakamoto, T.

AU - Cenko, S. B.

AU - Lien, A.

AU - Gehrels, N.

AU - Castro-tirado, A. J.

AU - Ricci, R.

AU - Capone, J.

AU - Toy, V.

AU - Kutyrev, A.

AU - Kawai, N.

AU - Cucchiara, A.

AU - Fruchter, A.

AU - Gorosabel, J.

AU - Jeong, S.

AU - Levan, A.

AU - Perley, D.

AU - Sanchez-ramirez, R.

AU - Tanvir, N.

AU - Veilleux, S.

PY - 2016/8/20

Y1 - 2016/8/20

N2 - We report the results of our observing campaign on GRB 140903A, a nearby (z = 0.351) short-duration (T90 ∼ 0.3 s) gamma-ray burst discovered by Swift. We monitored the X-ray afterglow with Chandra up to 15 days after the burst and detected a steeper decay of the X-ray flux after tj ≈ 1 day. Continued monitoring at optical and radio wavelengths showed a similar decay in flux at nearly the same time, and we interpret it as evidence of a narrowly collimated jet. By using the standard fireball model to describe the afterglow evolution, we derive a jet opening angle θj ≈ 5° and a collimation-corrected total energy release E ≈ 2 × 1050 erg. We further discuss the nature of the GRB progenitor system. Three main lines disfavor a massive star progenitor: the properties of the prompt gamma-ray emission, the age and low star formation rate of the host galaxy, and the lack of a bright supernova. We conclude that this event likely originated from a compact binary merger.

AB - We report the results of our observing campaign on GRB 140903A, a nearby (z = 0.351) short-duration (T90 ∼ 0.3 s) gamma-ray burst discovered by Swift. We monitored the X-ray afterglow with Chandra up to 15 days after the burst and detected a steeper decay of the X-ray flux after tj ≈ 1 day. Continued monitoring at optical and radio wavelengths showed a similar decay in flux at nearly the same time, and we interpret it as evidence of a narrowly collimated jet. By using the standard fireball model to describe the afterglow evolution, we derive a jet opening angle θj ≈ 5° and a collimation-corrected total energy release E ≈ 2 × 1050 erg. We further discuss the nature of the GRB progenitor system. Three main lines disfavor a massive star progenitor: the properties of the prompt gamma-ray emission, the age and low star formation rate of the host galaxy, and the lack of a bright supernova. We conclude that this event likely originated from a compact binary merger.

U2 - 10.3847/0004-637x/827/2/102

DO - 10.3847/0004-637x/827/2/102

M3 - Journal article

SN - 0004-637X

VL - 827

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 102

ER -

AN ACHROMATIC BREAK IN THE AFTERGLOW OF THE SHORT GRB 140903A: EVIDENCE FOR A NARROW JET

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