GRB 050505: A high-redshift burst discovered by Swift

C. P. Hurkett, J. P. Osborne, K. L. Page, E. Rol, M. R. Goad, P. T. O'Brien, A. Beardmore, O. Godet, D. N. Burrows, N. R. Tanvir, A. Levan, B. Zhang, D. Malesani, J. E. Hill, J. A. Kennea, R. Chapman, V. La Parola, M. Perri, P. Romano, R. SmithN. Gehrels

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We report the discovery and subsequent multiwavelength afterglow behaviour of the high-redshift (z = 4.27) Gamma Ray Burst (GRB) 050505. This burst is the third most-distant burst, measured by spectroscopic redshift, discovered after GRB 000131 (z = 4.50) and GRB 050904 (z = 6.29). GRB 050505 is a long GRB with a multipeaked γ-ray light curve, with a duration of T 90 = 63 ± 2 s and an inferred isotropic release in γ-rays of ∼ 4.44 × 10 53 erg in the 1-10 4 keV rest-frame energy range. The Swift X-Ray Telescope followed the afterglow for 14 d, detecting two breaks in the light curve at 7.4 -1.5 +1.5 and 58.0 -15.4 +9.9 ks after the burst trigger. The power-law decay slopes before, between and after these breaks were 0.25 -0.17 +0.16, 1-17 -0.09 +0.08 and 1.97 -0.28 +0.27, respectively. The light curve can also be fitted with a 'smoothly broken' power-law model with a break observed at ∼T + 18.5 ks, with decay slopes of ∼0.4 and ∼ 1.8, before and after the break, respectively. The X-ray afterglow shows no spectral variation over the course of the Swift observations, being well fitted with a single power law of photon index ∼1.90. This behaviour is expected for the cessation of the continued energization of the interstellar medium shock, followed by a break caused by a jet, either uniform or structured. Neither break is consistent with a cooling break. The spectral energy distribution, indeed, shows the cooling frequency to be below the X-ray but above the optical frequencies. The optical-X-ray spectrum also shows that there is significant X-ray absorption in excess of that due to our Galaxy but very little optical-ultraviolet extinction, with E(B -V) ≈ 0.10 for a Small Magellanic Cloud like extinction curve.

Original languageEnglish (US)
Pages (from-to)1101-1109
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume368
Issue number3
DOIs
StatePublished - May 1 2006

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gamma ray bursts
bursts
afterglows
light curve
power law
x rays
rays
extinction
slopes
cooling
Magellanic clouds
decay
spectral energy distribution
erg
energy
actuators
shock
telescopes
galaxies
photons

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hurkett, C. P., Osborne, J. P., Page, K. L., Rol, E., Goad, M. R., O'Brien, P. T., ... Gehrels, N. (2006). GRB 050505: A high-redshift burst discovered by Swift. Monthly Notices of the Royal Astronomical Society, 368(3), 1101-1109. https://doi.org/10.1111/j.1365-2966.2006.10188.x
Hurkett, C. P. ; Osborne, J. P. ; Page, K. L. ; Rol, E. ; Goad, M. R. ; O'Brien, P. T. ; Beardmore, A. ; Godet, O. ; Burrows, D. N. ; Tanvir, N. R. ; Levan, A. ; Zhang, B. ; Malesani, D. ; Hill, J. E. ; Kennea, J. A. ; Chapman, R. ; La Parola, V. ; Perri, M. ; Romano, P. ; Smith, R. ; Gehrels, N. / GRB 050505 : A high-redshift burst discovered by Swift. In: Monthly Notices of the Royal Astronomical Society. 2006 ; Vol. 368, No. 3. pp. 1101-1109.
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abstract = "We report the discovery and subsequent multiwavelength afterglow behaviour of the high-redshift (z = 4.27) Gamma Ray Burst (GRB) 050505. This burst is the third most-distant burst, measured by spectroscopic redshift, discovered after GRB 000131 (z = 4.50) and GRB 050904 (z = 6.29). GRB 050505 is a long GRB with a multipeaked γ-ray light curve, with a duration of T 90 = 63 ± 2 s and an inferred isotropic release in γ-rays of ∼ 4.44 × 10 53 erg in the 1-10 4 keV rest-frame energy range. The Swift X-Ray Telescope followed the afterglow for 14 d, detecting two breaks in the light curve at 7.4 -1.5 +1.5 and 58.0 -15.4 +9.9 ks after the burst trigger. The power-law decay slopes before, between and after these breaks were 0.25 -0.17 +0.16, 1-17 -0.09 +0.08 and 1.97 -0.28 +0.27, respectively. The light curve can also be fitted with a 'smoothly broken' power-law model with a break observed at ∼T + 18.5 ks, with decay slopes of ∼0.4 and ∼ 1.8, before and after the break, respectively. The X-ray afterglow shows no spectral variation over the course of the Swift observations, being well fitted with a single power law of photon index ∼1.90. This behaviour is expected for the cessation of the continued energization of the interstellar medium shock, followed by a break caused by a jet, either uniform or structured. Neither break is consistent with a cooling break. The spectral energy distribution, indeed, shows the cooling frequency to be below the X-ray but above the optical frequencies. The optical-X-ray spectrum also shows that there is significant X-ray absorption in excess of that due to our Galaxy but very little optical-ultraviolet extinction, with E(B -V) ≈ 0.10 for a Small Magellanic Cloud like extinction curve.",
author = "Hurkett, {C. P.} and Osborne, {J. P.} and Page, {K. L.} and E. Rol and Goad, {M. R.} and O'Brien, {P. T.} and A. Beardmore and O. Godet and Burrows, {D. N.} and Tanvir, {N. R.} and A. Levan and B. Zhang and D. Malesani and Hill, {J. E.} and Kennea, {J. A.} and R. Chapman and {La Parola}, V. and M. Perri and P. Romano and R. Smith and N. Gehrels",
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Hurkett, CP, Osborne, JP, Page, KL, Rol, E, Goad, MR, O'Brien, PT, Beardmore, A, Godet, O, Burrows, DN, Tanvir, NR, Levan, A, Zhang, B, Malesani, D, Hill, JE, Kennea, JA, Chapman, R, La Parola, V, Perri, M, Romano, P, Smith, R & Gehrels, N 2006, 'GRB 050505: A high-redshift burst discovered by Swift', Monthly Notices of the Royal Astronomical Society, vol. 368, no. 3, pp. 1101-1109. https://doi.org/10.1111/j.1365-2966.2006.10188.x

GRB 050505 : A high-redshift burst discovered by Swift. / Hurkett, C. P.; Osborne, J. P.; Page, K. L.; Rol, E.; Goad, M. R.; O'Brien, P. T.; Beardmore, A.; Godet, O.; Burrows, D. N.; Tanvir, N. R.; Levan, A.; Zhang, B.; Malesani, D.; Hill, J. E.; Kennea, J. A.; Chapman, R.; La Parola, V.; Perri, M.; Romano, P.; Smith, R.; Gehrels, N.

In: Monthly Notices of the Royal Astronomical Society, Vol. 368, No. 3, 01.05.2006, p. 1101-1109.

Research output: Contribution to journalArticle

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T2 - A high-redshift burst discovered by Swift

AU - Hurkett, C. P.

AU - Osborne, J. P.

AU - Page, K. L.

AU - Rol, E.

AU - Goad, M. R.

AU - O'Brien, P. T.

AU - Beardmore, A.

AU - Godet, O.

AU - Burrows, D. N.

AU - Tanvir, N. R.

AU - Levan, A.

AU - Zhang, B.

AU - Malesani, D.

AU - Hill, J. E.

AU - Kennea, J. A.

AU - Chapman, R.

AU - La Parola, V.

AU - Perri, M.

AU - Romano, P.

AU - Smith, R.

AU - Gehrels, N.

PY - 2006/5/1

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N2 - We report the discovery and subsequent multiwavelength afterglow behaviour of the high-redshift (z = 4.27) Gamma Ray Burst (GRB) 050505. This burst is the third most-distant burst, measured by spectroscopic redshift, discovered after GRB 000131 (z = 4.50) and GRB 050904 (z = 6.29). GRB 050505 is a long GRB with a multipeaked γ-ray light curve, with a duration of T 90 = 63 ± 2 s and an inferred isotropic release in γ-rays of ∼ 4.44 × 10 53 erg in the 1-10 4 keV rest-frame energy range. The Swift X-Ray Telescope followed the afterglow for 14 d, detecting two breaks in the light curve at 7.4 -1.5 +1.5 and 58.0 -15.4 +9.9 ks after the burst trigger. The power-law decay slopes before, between and after these breaks were 0.25 -0.17 +0.16, 1-17 -0.09 +0.08 and 1.97 -0.28 +0.27, respectively. The light curve can also be fitted with a 'smoothly broken' power-law model with a break observed at ∼T + 18.5 ks, with decay slopes of ∼0.4 and ∼ 1.8, before and after the break, respectively. The X-ray afterglow shows no spectral variation over the course of the Swift observations, being well fitted with a single power law of photon index ∼1.90. This behaviour is expected for the cessation of the continued energization of the interstellar medium shock, followed by a break caused by a jet, either uniform or structured. Neither break is consistent with a cooling break. The spectral energy distribution, indeed, shows the cooling frequency to be below the X-ray but above the optical frequencies. The optical-X-ray spectrum also shows that there is significant X-ray absorption in excess of that due to our Galaxy but very little optical-ultraviolet extinction, with E(B -V) ≈ 0.10 for a Small Magellanic Cloud like extinction curve.

AB - We report the discovery and subsequent multiwavelength afterglow behaviour of the high-redshift (z = 4.27) Gamma Ray Burst (GRB) 050505. This burst is the third most-distant burst, measured by spectroscopic redshift, discovered after GRB 000131 (z = 4.50) and GRB 050904 (z = 6.29). GRB 050505 is a long GRB with a multipeaked γ-ray light curve, with a duration of T 90 = 63 ± 2 s and an inferred isotropic release in γ-rays of ∼ 4.44 × 10 53 erg in the 1-10 4 keV rest-frame energy range. The Swift X-Ray Telescope followed the afterglow for 14 d, detecting two breaks in the light curve at 7.4 -1.5 +1.5 and 58.0 -15.4 +9.9 ks after the burst trigger. The power-law decay slopes before, between and after these breaks were 0.25 -0.17 +0.16, 1-17 -0.09 +0.08 and 1.97 -0.28 +0.27, respectively. The light curve can also be fitted with a 'smoothly broken' power-law model with a break observed at ∼T + 18.5 ks, with decay slopes of ∼0.4 and ∼ 1.8, before and after the break, respectively. The X-ray afterglow shows no spectral variation over the course of the Swift observations, being well fitted with a single power law of photon index ∼1.90. This behaviour is expected for the cessation of the continued energization of the interstellar medium shock, followed by a break caused by a jet, either uniform or structured. Neither break is consistent with a cooling break. The spectral energy distribution, indeed, shows the cooling frequency to be below the X-ray but above the optical frequencies. The optical-X-ray spectrum also shows that there is significant X-ray absorption in excess of that due to our Galaxy but very little optical-ultraviolet extinction, with E(B -V) ≈ 0.10 for a Small Magellanic Cloud like extinction curve.

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Hurkett CP, Osborne JP, Page KL, Rol E, Goad MR, O'Brien PT et al. GRB 050505: A high-redshift burst discovered by Swift. Monthly Notices of the Royal Astronomical Society. 2006 May 1;368(3):1101-1109. https://doi.org/10.1111/j.1365-2966.2006.10188.x