GRB 071003

Broadband follow-up observations of a very bright gamma-ray burst in a galactic halo

D. A. Perley, W. Li, R. Chornock, J. X. Prochaska, N. R. Butler, P. Chandra, L. K. Pollack, J. S. Bloom, A. V. Fllippenko, H. Swan, F. Yuan, C. Akerlof, M. W. Auger, S. B. Cenko, H. W. Chen, C. D. Fassnacht, Derek Brindley Fox, D. Frail, E. M. Johansson, T. McKay & 9 others D. Le Mignant, M. Modjaz, W. Rujopakarn, R. Russel, M. A. Skinner, G. H. Smith, I. Smith, M. A. Van Dam, S. Yost

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The optical afterglow of long-duration GRB 071003 is among the brightest yet to be detected from any GRB, with A ≈ 12 mag in KAIT observations starting 42 s after the GRB trigger, including filtered detections during prompt emission. However, our high-S/N afterglow spectrum displays only extremely weak absorption lines at what we argue is the host redshift of z = 1.60435, in contrast to the three other, much stronger Mg IT absorption systems observed at lower redshifts. Together with Keck adaptive optics observations, which fail to reveal a host galaxy coincident with the burst position, our observations suggest a halo progenitor and offer a cautionary tale about the use of Mg n for GRB redshift determination. We present early- through late-time observations spanning the electro-magnetic spectrum, constrain the connection between the prompt emission and early variations in the light curve (we observe no correlation), and discuss possible origins for an unusual, marked rebrightening that occurs a few hours after the burst: likely either a late-time refreshed shock or a wide-angle secondary jet. Analysis of the late-time afterglow is most consistent with a wind environment, suggesting a massive star progenitor. Together with GRB 070125, this may indicate that a small but significant portion of star formation in the early universe occurred far outside what we consider a normal galactic disk.

Original languageEnglish (US)
Pages (from-to)470-490
Number of pages21
JournalAstrophysical Journal
Volume688
Issue number1
DOIs
StatePublished - Nov 20 2008

Fingerprint

galactic halos
gamma ray bursts
afterglows
broadband
bursts
electromagnetic spectra
massive stars
adaptive optics
light curve
star formation
halos
universe
actuators
shock
galaxies

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Perley, D. A., Li, W., Chornock, R., Prochaska, J. X., Butler, N. R., Chandra, P., ... Yost, S. (2008). GRB 071003: Broadband follow-up observations of a very bright gamma-ray burst in a galactic halo. Astrophysical Journal, 688(1), 470-490. https://doi.org/10.1086/591961
Perley, D. A. ; Li, W. ; Chornock, R. ; Prochaska, J. X. ; Butler, N. R. ; Chandra, P. ; Pollack, L. K. ; Bloom, J. S. ; Fllippenko, A. V. ; Swan, H. ; Yuan, F. ; Akerlof, C. ; Auger, M. W. ; Cenko, S. B. ; Chen, H. W. ; Fassnacht, C. D. ; Fox, Derek Brindley ; Frail, D. ; Johansson, E. M. ; McKay, T. ; Le Mignant, D. ; Modjaz, M. ; Rujopakarn, W. ; Russel, R. ; Skinner, M. A. ; Smith, G. H. ; Smith, I. ; Van Dam, M. A. ; Yost, S. / GRB 071003 : Broadband follow-up observations of a very bright gamma-ray burst in a galactic halo. In: Astrophysical Journal. 2008 ; Vol. 688, No. 1. pp. 470-490.
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abstract = "The optical afterglow of long-duration GRB 071003 is among the brightest yet to be detected from any GRB, with A ≈ 12 mag in KAIT observations starting 42 s after the GRB trigger, including filtered detections during prompt emission. However, our high-S/N afterglow spectrum displays only extremely weak absorption lines at what we argue is the host redshift of z = 1.60435, in contrast to the three other, much stronger Mg IT absorption systems observed at lower redshifts. Together with Keck adaptive optics observations, which fail to reveal a host galaxy coincident with the burst position, our observations suggest a halo progenitor and offer a cautionary tale about the use of Mg n for GRB redshift determination. We present early- through late-time observations spanning the electro-magnetic spectrum, constrain the connection between the prompt emission and early variations in the light curve (we observe no correlation), and discuss possible origins for an unusual, marked rebrightening that occurs a few hours after the burst: likely either a late-time refreshed shock or a wide-angle secondary jet. Analysis of the late-time afterglow is most consistent with a wind environment, suggesting a massive star progenitor. Together with GRB 070125, this may indicate that a small but significant portion of star formation in the early universe occurred far outside what we consider a normal galactic disk.",
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Perley, DA, Li, W, Chornock, R, Prochaska, JX, Butler, NR, Chandra, P, Pollack, LK, Bloom, JS, Fllippenko, AV, Swan, H, Yuan, F, Akerlof, C, Auger, MW, Cenko, SB, Chen, HW, Fassnacht, CD, Fox, DB, Frail, D, Johansson, EM, McKay, T, Le Mignant, D, Modjaz, M, Rujopakarn, W, Russel, R, Skinner, MA, Smith, GH, Smith, I, Van Dam, MA & Yost, S 2008, 'GRB 071003: Broadband follow-up observations of a very bright gamma-ray burst in a galactic halo', Astrophysical Journal, vol. 688, no. 1, pp. 470-490. https://doi.org/10.1086/591961

GRB 071003 : Broadband follow-up observations of a very bright gamma-ray burst in a galactic halo. / Perley, D. A.; Li, W.; Chornock, R.; Prochaska, J. X.; Butler, N. R.; Chandra, P.; Pollack, L. K.; Bloom, J. S.; Fllippenko, A. V.; Swan, H.; Yuan, F.; Akerlof, C.; Auger, M. W.; Cenko, S. B.; Chen, H. W.; Fassnacht, C. D.; Fox, Derek Brindley; Frail, D.; Johansson, E. M.; McKay, T.; Le Mignant, D.; Modjaz, M.; Rujopakarn, W.; Russel, R.; Skinner, M. A.; Smith, G. H.; Smith, I.; Van Dam, M. A.; Yost, S.

In: Astrophysical Journal, Vol. 688, No. 1, 20.11.2008, p. 470-490.

Research output: Contribution to journalArticle

TY - JOUR

T1 - GRB 071003

T2 - Broadband follow-up observations of a very bright gamma-ray burst in a galactic halo

AU - Perley, D. A.

AU - Li, W.

AU - Chornock, R.

AU - Prochaska, J. X.

AU - Butler, N. R.

AU - Chandra, P.

AU - Pollack, L. K.

AU - Bloom, J. S.

AU - Fllippenko, A. V.

AU - Swan, H.

AU - Yuan, F.

AU - Akerlof, C.

AU - Auger, M. W.

AU - Cenko, S. B.

AU - Chen, H. W.

AU - Fassnacht, C. D.

AU - Fox, Derek Brindley

AU - Frail, D.

AU - Johansson, E. M.

AU - McKay, T.

AU - Le Mignant, D.

AU - Modjaz, M.

AU - Rujopakarn, W.

AU - Russel, R.

AU - Skinner, M. A.

AU - Smith, G. H.

AU - Smith, I.

AU - Van Dam, M. A.

AU - Yost, S.

PY - 2008/11/20

Y1 - 2008/11/20

N2 - The optical afterglow of long-duration GRB 071003 is among the brightest yet to be detected from any GRB, with A ≈ 12 mag in KAIT observations starting 42 s after the GRB trigger, including filtered detections during prompt emission. However, our high-S/N afterglow spectrum displays only extremely weak absorption lines at what we argue is the host redshift of z = 1.60435, in contrast to the three other, much stronger Mg IT absorption systems observed at lower redshifts. Together with Keck adaptive optics observations, which fail to reveal a host galaxy coincident with the burst position, our observations suggest a halo progenitor and offer a cautionary tale about the use of Mg n for GRB redshift determination. We present early- through late-time observations spanning the electro-magnetic spectrum, constrain the connection between the prompt emission and early variations in the light curve (we observe no correlation), and discuss possible origins for an unusual, marked rebrightening that occurs a few hours after the burst: likely either a late-time refreshed shock or a wide-angle secondary jet. Analysis of the late-time afterglow is most consistent with a wind environment, suggesting a massive star progenitor. Together with GRB 070125, this may indicate that a small but significant portion of star formation in the early universe occurred far outside what we consider a normal galactic disk.

AB - The optical afterglow of long-duration GRB 071003 is among the brightest yet to be detected from any GRB, with A ≈ 12 mag in KAIT observations starting 42 s after the GRB trigger, including filtered detections during prompt emission. However, our high-S/N afterglow spectrum displays only extremely weak absorption lines at what we argue is the host redshift of z = 1.60435, in contrast to the three other, much stronger Mg IT absorption systems observed at lower redshifts. Together with Keck adaptive optics observations, which fail to reveal a host galaxy coincident with the burst position, our observations suggest a halo progenitor and offer a cautionary tale about the use of Mg n for GRB redshift determination. We present early- through late-time observations spanning the electro-magnetic spectrum, constrain the connection between the prompt emission and early variations in the light curve (we observe no correlation), and discuss possible origins for an unusual, marked rebrightening that occurs a few hours after the burst: likely either a late-time refreshed shock or a wide-angle secondary jet. Analysis of the late-time afterglow is most consistent with a wind environment, suggesting a massive star progenitor. Together with GRB 070125, this may indicate that a small but significant portion of star formation in the early universe occurred far outside what we consider a normal galactic disk.

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U2 - 10.1086/591961

DO - 10.1086/591961

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Perley DA, Li W, Chornock R, Prochaska JX, Butler NR, Chandra P et al. GRB 071003: Broadband follow-up observations of a very bright gamma-ray burst in a galactic halo. Astrophysical Journal. 2008 Nov 20;688(1):470-490. https://doi.org/10.1086/591961