Correlated optical and X-ray flares in the afterglow of XRF 071031

T. Krühler, J. Greiner, S. McBreen, S. Klose, A. Rossi, P. Afonso, C. Clemens, R. Filgas, A. Küpcü Yolda, G. Szokoly, A. Yolda

Research output: Article

53 Citations (Scopus)

Abstract

We present a densely sampled early light curve of the optical/near-infrared (NIR) afterglow of the X-Ray Flash (XRF) 071031 at z = 2.692. Simultaneous and continuous observations in seven photometric bands from g′ to K S with GROND (Gamma-Ray Burst Optical/Near-InfraRed Detector) at the 2.2-m MPI/ESO telescope on LaSilla were performed between 4 minutes and 7 hr after the burst. The light curve consists of 547 individual points which allows us to study the early evolution of the optical transient associated with XRF 071031 in great detail. The optical/NIR light curve is dominated by an early increase in brightness which can be attributed to the apparent onset of the forward shock emission. There are several bumps which are superimposed onto the overall rise and decay. Significant flaring is also visible in the Swift X-Ray Telescope (XRT) light curve from early to late times. The availability of high-quality, broadband data enables detailed studies of the connection between the X-ray and optical/NIR afterglow and its color evolution during the first night postburst. We find evidence of spectral hardening in the optical bands contemporaneous with the emergence of the bumps from an underlying afterglow component. The bumps in the optical/NIR light curve can be associated with flares in the X-ray regime suggesting late central engine activity as the common origin.

Original languageEnglish
Pages (from-to)758-768
Number of pages11
JournalAstrophysical Journal
Volume697
Issue number1
DOIs
Publication statusPublished - 2009

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afterglows
flares
light curve
flash
near infrared
x rays
telescopes
broadband data
infrared detectors
European Southern Observatory
hardening
gamma ray bursts
night
availability
engines
bursts
engine
brightness
shock
broadband

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics
  • Nuclear and High Energy Physics

Cite this

Krühler, T., Greiner, J., McBreen, S., Klose, S., Rossi, A., Afonso, P., ... Yolda, A. (2009). Correlated optical and X-ray flares in the afterglow of XRF 071031. Astrophysical Journal, 697(1), 758-768. https://doi.org/10.1088/0004-637X/697/1/758

Correlated optical and X-ray flares in the afterglow of XRF 071031. / Krühler, T.; Greiner, J.; McBreen, S.; Klose, S.; Rossi, A.; Afonso, P.; Clemens, C.; Filgas, R.; Yolda, A. Küpcü; Szokoly, G.; Yolda, A.

In: Astrophysical Journal, Vol. 697, No. 1, 2009, p. 758-768.

Research output: Article

Krühler, T, Greiner, J, McBreen, S, Klose, S, Rossi, A, Afonso, P, Clemens, C, Filgas, R, Yolda, AK, Szokoly, G & Yolda, A 2009, 'Correlated optical and X-ray flares in the afterglow of XRF 071031', Astrophysical Journal, vol. 697, no. 1, pp. 758-768. https://doi.org/10.1088/0004-637X/697/1/758
Krühler T, Greiner J, McBreen S, Klose S, Rossi A, Afonso P et al. Correlated optical and X-ray flares in the afterglow of XRF 071031. Astrophysical Journal. 2009;697(1):758-768. https://doi.org/10.1088/0004-637X/697/1/758
Krühler, T. ; Greiner, J. ; McBreen, S. ; Klose, S. ; Rossi, A. ; Afonso, P. ; Clemens, C. ; Filgas, R. ; Yolda, A. Küpcü ; Szokoly, G. ; Yolda, A. / Correlated optical and X-ray flares in the afterglow of XRF 071031. In: Astrophysical Journal. 2009 ; Vol. 697, No. 1. pp. 758-768.
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