Optical, infrared, and ultraviolet observations of the X-ray flash XRF 050416A

S. T. Holland, P. T. Boyd, J. Gorosabel, J. Hjorth, P. Schady, B. Thomsen, T. Augusteijn, A. J. Blustin, A. Breeveld, M. De Pasquale, J. P.U. Fynbo, N. Gehrels, Caryl Ann Gronwall, S. Hunsberger, M. Ivanushkina, W. Landsman, P. Laursen, K. McGowan, V. Mangano, C. B. MarkwardtF. Marshall, K. O. Mason, A. Moretti, M. J. Page, T. Poole, P. Roming, S. Rosen, M. Still

Research output: Contribution to journalArticle

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Abstract

We present ultraviolet, optical, and infrared photometry of the afterglow of the X-ray flash XRF 050416A taken between approximately 100 s and 36 days after the burst. We find an intrinsic spectral slope between 1930 and 22200 A of β= -1.14 ± 0.20 and a decay rate of a = -0.86 ± 0.15. There is no evidence for a change in the decay rate between approximately 0.7 and 4.7 days after the burst. Our data imply that there is no spectral break between the optical and X-ray bands between 0.7 and 4.7 days after the burst and are consistent with the cooling break being redward of the KS, band (22200 Å) at 0.7 days. The combined ultraviolet/optical/infrared spectral energy distribution shows no evidence for a significant amount of extinction in the host galaxy along the line of sight to XRF 050416A. Our data suggest that the extragalactic extinction along the line of sight to the burst is only approximately AV = 0.2 mag, which is significantly less than the extinction expected from the hydrogen column density inferred from X-ray observations of XRF 050416A assuming a dust-to-gas ratio similar to what is found for the Milky Way. The observed extinction, however, is consistent with the dust-to-gas ratio seen in the Small Magellanic Cloud. We suggest that XRF 050416A may have a two-component jet similar to what has been proposed for GRB 030329. If this is the case, the lack of an observed jet break between 0.7 and 42 days is an illusion due to emission from the wide jet dominating the afterglow after approximately 1.5 days.

Original languageEnglish (US)
Pages (from-to)122-129
Number of pages8
JournalAstronomical Journal
Volume133
Issue number1
DOIs
StatePublished - Jan 1 2007

Fingerprint

X-ray fluorescence
flash
bursts
extinction
afterglows
line of sight
decay rates
ultraviolet photometry
x rays
dust
illusions
infrared photometry
Magellanic clouds
spectral energy distribution
gases
gas
photometry
hydrogen
slopes
galaxies

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Holland, S. T., Boyd, P. T., Gorosabel, J., Hjorth, J., Schady, P., Thomsen, B., ... Still, M. (2007). Optical, infrared, and ultraviolet observations of the X-ray flash XRF 050416A. Astronomical Journal, 133(1), 122-129. https://doi.org/10.1086/509656
Holland, S. T. ; Boyd, P. T. ; Gorosabel, J. ; Hjorth, J. ; Schady, P. ; Thomsen, B. ; Augusteijn, T. ; Blustin, A. J. ; Breeveld, A. ; De Pasquale, M. ; Fynbo, J. P.U. ; Gehrels, N. ; Gronwall, Caryl Ann ; Hunsberger, S. ; Ivanushkina, M. ; Landsman, W. ; Laursen, P. ; McGowan, K. ; Mangano, V. ; Markwardt, C. B. ; Marshall, F. ; Mason, K. O. ; Moretti, A. ; Page, M. J. ; Poole, T. ; Roming, P. ; Rosen, S. ; Still, M. / Optical, infrared, and ultraviolet observations of the X-ray flash XRF 050416A. In: Astronomical Journal. 2007 ; Vol. 133, No. 1. pp. 122-129.
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abstract = "We present ultraviolet, optical, and infrared photometry of the afterglow of the X-ray flash XRF 050416A taken between approximately 100 s and 36 days after the burst. We find an intrinsic spectral slope between 1930 and 22200 A of β= -1.14 ± 0.20 and a decay rate of a = -0.86 ± 0.15. There is no evidence for a change in the decay rate between approximately 0.7 and 4.7 days after the burst. Our data imply that there is no spectral break between the optical and X-ray bands between 0.7 and 4.7 days after the burst and are consistent with the cooling break being redward of the KS, band (22200 {\AA}) at 0.7 days. The combined ultraviolet/optical/infrared spectral energy distribution shows no evidence for a significant amount of extinction in the host galaxy along the line of sight to XRF 050416A. Our data suggest that the extragalactic extinction along the line of sight to the burst is only approximately AV = 0.2 mag, which is significantly less than the extinction expected from the hydrogen column density inferred from X-ray observations of XRF 050416A assuming a dust-to-gas ratio similar to what is found for the Milky Way. The observed extinction, however, is consistent with the dust-to-gas ratio seen in the Small Magellanic Cloud. We suggest that XRF 050416A may have a two-component jet similar to what has been proposed for GRB 030329. If this is the case, the lack of an observed jet break between 0.7 and 42 days is an illusion due to emission from the wide jet dominating the afterglow after approximately 1.5 days.",
author = "Holland, {S. T.} and Boyd, {P. T.} and J. Gorosabel and J. Hjorth and P. Schady and B. Thomsen and T. Augusteijn and Blustin, {A. J.} and A. Breeveld and {De Pasquale}, M. and Fynbo, {J. P.U.} and N. Gehrels and Gronwall, {Caryl Ann} and S. Hunsberger and M. Ivanushkina and W. Landsman and P. Laursen and K. McGowan and V. Mangano and Markwardt, {C. B.} and F. Marshall and Mason, {K. O.} and A. Moretti and Page, {M. J.} and T. Poole and P. Roming and S. Rosen and M. Still",
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Holland, ST, Boyd, PT, Gorosabel, J, Hjorth, J, Schady, P, Thomsen, B, Augusteijn, T, Blustin, AJ, Breeveld, A, De Pasquale, M, Fynbo, JPU, Gehrels, N, Gronwall, CA, Hunsberger, S, Ivanushkina, M, Landsman, W, Laursen, P, McGowan, K, Mangano, V, Markwardt, CB, Marshall, F, Mason, KO, Moretti, A, Page, MJ, Poole, T, Roming, P, Rosen, S & Still, M 2007, 'Optical, infrared, and ultraviolet observations of the X-ray flash XRF 050416A', Astronomical Journal, vol. 133, no. 1, pp. 122-129. https://doi.org/10.1086/509656

Optical, infrared, and ultraviolet observations of the X-ray flash XRF 050416A. / Holland, S. T.; Boyd, P. T.; Gorosabel, J.; Hjorth, J.; Schady, P.; Thomsen, B.; Augusteijn, T.; Blustin, A. J.; Breeveld, A.; De Pasquale, M.; Fynbo, J. P.U.; Gehrels, N.; Gronwall, Caryl Ann; Hunsberger, S.; Ivanushkina, M.; Landsman, W.; Laursen, P.; McGowan, K.; Mangano, V.; Markwardt, C. B.; Marshall, F.; Mason, K. O.; Moretti, A.; Page, M. J.; Poole, T.; Roming, P.; Rosen, S.; Still, M.

In: Astronomical Journal, Vol. 133, No. 1, 01.01.2007, p. 122-129.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Optical, infrared, and ultraviolet observations of the X-ray flash XRF 050416A

AU - Holland, S. T.

AU - Boyd, P. T.

AU - Gorosabel, J.

AU - Hjorth, J.

AU - Schady, P.

AU - Thomsen, B.

AU - Augusteijn, T.

AU - Blustin, A. J.

AU - Breeveld, A.

AU - De Pasquale, M.

AU - Fynbo, J. P.U.

AU - Gehrels, N.

AU - Gronwall, Caryl Ann

AU - Hunsberger, S.

AU - Ivanushkina, M.

AU - Landsman, W.

AU - Laursen, P.

AU - McGowan, K.

AU - Mangano, V.

AU - Markwardt, C. B.

AU - Marshall, F.

AU - Mason, K. O.

AU - Moretti, A.

AU - Page, M. J.

AU - Poole, T.

AU - Roming, P.

AU - Rosen, S.

AU - Still, M.

PY - 2007/1/1

Y1 - 2007/1/1

N2 - We present ultraviolet, optical, and infrared photometry of the afterglow of the X-ray flash XRF 050416A taken between approximately 100 s and 36 days after the burst. We find an intrinsic spectral slope between 1930 and 22200 A of β= -1.14 ± 0.20 and a decay rate of a = -0.86 ± 0.15. There is no evidence for a change in the decay rate between approximately 0.7 and 4.7 days after the burst. Our data imply that there is no spectral break between the optical and X-ray bands between 0.7 and 4.7 days after the burst and are consistent with the cooling break being redward of the KS, band (22200 Å) at 0.7 days. The combined ultraviolet/optical/infrared spectral energy distribution shows no evidence for a significant amount of extinction in the host galaxy along the line of sight to XRF 050416A. Our data suggest that the extragalactic extinction along the line of sight to the burst is only approximately AV = 0.2 mag, which is significantly less than the extinction expected from the hydrogen column density inferred from X-ray observations of XRF 050416A assuming a dust-to-gas ratio similar to what is found for the Milky Way. The observed extinction, however, is consistent with the dust-to-gas ratio seen in the Small Magellanic Cloud. We suggest that XRF 050416A may have a two-component jet similar to what has been proposed for GRB 030329. If this is the case, the lack of an observed jet break between 0.7 and 42 days is an illusion due to emission from the wide jet dominating the afterglow after approximately 1.5 days.

AB - We present ultraviolet, optical, and infrared photometry of the afterglow of the X-ray flash XRF 050416A taken between approximately 100 s and 36 days after the burst. We find an intrinsic spectral slope between 1930 and 22200 A of β= -1.14 ± 0.20 and a decay rate of a = -0.86 ± 0.15. There is no evidence for a change in the decay rate between approximately 0.7 and 4.7 days after the burst. Our data imply that there is no spectral break between the optical and X-ray bands between 0.7 and 4.7 days after the burst and are consistent with the cooling break being redward of the KS, band (22200 Å) at 0.7 days. The combined ultraviolet/optical/infrared spectral energy distribution shows no evidence for a significant amount of extinction in the host galaxy along the line of sight to XRF 050416A. Our data suggest that the extragalactic extinction along the line of sight to the burst is only approximately AV = 0.2 mag, which is significantly less than the extinction expected from the hydrogen column density inferred from X-ray observations of XRF 050416A assuming a dust-to-gas ratio similar to what is found for the Milky Way. The observed extinction, however, is consistent with the dust-to-gas ratio seen in the Small Magellanic Cloud. We suggest that XRF 050416A may have a two-component jet similar to what has been proposed for GRB 030329. If this is the case, the lack of an observed jet break between 0.7 and 42 days is an illusion due to emission from the wide jet dominating the afterglow after approximately 1.5 days.

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Holland ST, Boyd PT, Gorosabel J, Hjorth J, Schady P, Thomsen B et al. Optical, infrared, and ultraviolet observations of the X-ray flash XRF 050416A. Astronomical Journal. 2007 Jan 1;133(1):122-129. https://doi.org/10.1086/509656