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Comprehensive multiwavelength modelling of the afterglow of GRB 050525A

  1. L. Resmi1,2,*,
  2. K. Misra3,4,
  3. G. Jóhannesson5,
  4. A. J. Castro-Tirado6,
  5. J. Gorosabel6,
  6. M. Jelínek6,
  7. D. Bhattacharya4,
  8. P. Kubánek6,
  9. G. C. Anupama7,
  10. A. Sota6,
  11. D. K. Sahu7,
  12. A. de Ugarte Postigo8,
  13. S. B. Pandey9,
  14. R. Sánchez-Ramírez6,
  15. M. Bremer10,
  16. R. Sagar9

Article first published online: 30 OCT 2012

DOI: 10.1111/j.1365-2966.2012.21713.x

Issue

Monthly Notices of the Royal Astronomical Society

Monthly Notices of the Royal Astronomical Society

Volume 427, Issue 1, pages 288–297, 21 November 2012

Additional Information

How to Cite

Resmi, L., Misra, K., Jóhannesson, G., Castro-Tirado, A. J., Gorosabel, J., Jelínek, M., Bhattacharya, D., Kubánek, P., Anupama, G. C., Sota, A., Sahu, D. K., de Ugarte Postigo, A., Pandey, S. B., Sánchez-Ramírez, R., Bremer, M. and Sagar, R. (2012), Comprehensive multiwavelength modelling of the afterglow of GRB 050525A. Monthly Notices of the Royal Astronomical Society, 427: 288–297. doi: 10.1111/j.1365-2966.2012.21713.x

Author Information

  1. 1

    Tata Institute of Fundamental Research, Mumbai, India

  2. 2

    Institut d’Astrophysique de Paris, Paris, France

  3. 3

    Space Telescope Science Institute, Baltimore, MD, USA

  4. 4

    Inter University Center for Astronomy and Astrophysics, Pune, India

  5. 5

    Science Institute, University of Iceland, Reykjavik, Iceland

  6. 6

    Instituto de Astrofísica de Andalucía (IAA-CSIC), Granada, Spain

  7. 7

    Indian Institute of Astrophysics, Bangalore, India

  8. 8

    Dark Cosmology Center, Niels Bohr Institute, Copenhagen, Denmark

  9. 9

    Aryabhatta Research Institute of Observational Sciences, Nainital, India

  10. 10

    Institute de Radioastronomie Millimétrique (IRAM), Saint Martin Hères, France

*E-mail: resmi@tifr.res.in

Publication History

  1. Issue published online: 29 OCT 2012
  2. Article first published online: 30 OCT 2012
  3. Manuscript Accepted: 11 JUL 2012
  4. Manuscript Received: 11 JUL 2012

Funded by

  • INSU/CNRS
  • MPG
  • IGN
  • Spanish MICINN. Grant Numbers: AYA2009-14000-C03-01, AYA2008-03467/ESP
  • DNRF

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Keywords:

  • techniques: photometric;
  • gamma-ray burst: individual: GRB 050525A

ABSTRACT

The Swift era has posed a challenge to the standard blast-wave model of gamma-ray burst (GRB) afterglows. The key observational features expected within the model are rarely observed, such as the achromatic steepening (‘jet break’) of light curves. The observed afterglow light curves showcase additional complex features requiring modifications within the standard model. Here we present optical/near-infrared observations, millimetre upper limits and comprehensive broad-band modelling of the afterglow of the bright GRB 0505025A, detected by Swift. This afterglow cannot be explained by the simplistic form of the standard blast-wave model. We attempt modelling multiwavelength light curves using (i) a forward–reverse shock model, (ii) a two-component outflow model and (iii) a blast-wave model with a wind termination shock. The forward–reverse shock model cannot explain the evolution of the afterglow. The two-component model is able to explain the average behaviour of the afterglow very well but cannot reproduce the fluctuations in the early X-ray light curve. The wind termination shock model reproduces the early light curves well but deviates from the global behaviour of the late-time afterglow.

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