Comprehensive multi-wavelength modelling of the afterglow of GRB050525A

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 the light curves. The observed afterglow light curves showcase additional complex features requiring modifications within the standard model. Here we present optical/NIR observations, millimeter upper limits and comprehensive broadband 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 the multi-wavelength light curves using (i) a forward-reverse shock model, (ii) a two-component outflow model and (iii) 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.

20 pages, 6 figures, accepted for publication in MNRAS

References in corpus (9)

• The First Survey of X-ray Flares from Gamma Ray Bursts Observed by Swift: Temporal Properties and Morphology
• A Comprehensive Analysis of Swift/XRT Data: III. Jet Break Candidates in X-ray and Optical Afterglow Lightcurves
• The Collimation and Energetics of the Brightest Swift Gamma-Ray Bursts
• Hypernova Signatures in the Late Rebrightening of GRB 050525A
• Forming a constant density medium close to long gamma-ray bursts
• Asymmetric Wolf-Rayet winds: implications for GRB afterglows
• Hard Electron Energy Distribution in the Relativistic Shocks of GRB Afterglows
• A Direct Measurement of the Dust Extinction Curve in an Intermediate-Redshift Galaxy
• The circumstellar environment of rotating Wolf-Rayet Stars and the implications for GRB afterglows

Cited by in corpus (11)

• A Hubble Space Telescope Survey of the Host Galaxies of Superluminous Supernovae
• A Large Catalogue of Multi-wavelength GRB Afterglows I: Color Evolution And Its Physical Implication
• GRB 110715A: The peculiar multiwavelength evolution of the first afterglow detected by ALMA
• Investigating the impact of optical selection effects on observed rest frame prompt GRB properties
• A decade of GRB follow-up by BOOTES in Spain (2003-2013)
• Radio data challenge the broadband modelling of GRB160131A afterglow
• Core-collapse Supernovae and Gamma-ray Bursts in TMT Era
• Unveiling the nature of the Einstein Probe transient EP 241021a
• Chromatic Afterglow of GRB 200829A
• Radio Afterglows of Gamma Ray Bursts
• Low-energy electrons in GRB afterglow models