Extinction properties of the X-ray bright/optically faint afterglow of GRB 020405

Abstract

We present an optical-to-X-ray spectral analysis of the afterglow of GRB 020405. The optical spectral energy distribution not corrected for the extragalactic extinction is significantly below the X-ray extrapolation of the single powerlaw spectral model suggested by multiwavelength studies. We investigate whether considerable extinction could explain the observed spectral ``mismatch'' by testing several types of extinction curves. For the first time we test extinction curves computed with time-dependent numerical simulations of dust grains destruction by the burst radiation. We find that an extinction law weakly depen dent on wavelength can reconcile the unabsorbed optical and X-ray data with the expected synchrotron spectrum. A gray extinction law can be provided by a dust grain size distribution biased toward large grains.

arXiv comment6 pages, 5 figures, accepted for publication on A&A

References in corpus (34)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• Discovery of the peculiar supernova 1998bw in the error box of GRB980425
• Spectroscopic Discovery of the Supernova 2003dh Associated with GRB 030329
• The Shape of Spectral Breaks in GRB Afterglows
• On The Synchrotron Self-Compton Emission from Relativistic Shocks and Its Implications for Gamma-Ray Burst Afterglows
• Reddening and Star Formation in Starburst Galaxies
• SN 2003lw and GRB 031203: A Bright Supernova for a Faint Gamma-ray Burst
• Dust sublimation by GRBs and its implications
• A supernova origin for dust in a high-redshift quasar
• High column densities and low extinctions of gamma-ray bursts: Evidence for hypernovae and dust destruction
• Dust in active nuclei. II. Powder or gravel?
• The host of GRB 030323 at z=3.372: a very high column density DLA system with a low metallicity
• Evidence for Supernova Signatures in the Spectrum of the Late-time Bump of the Optical Afterglow of GRB 021211
• X-ray Destruction of Dust Along the Line of Sight to Gamma-Ray Bursts
• Heavy Element Abundances and Dust Depletions in the Host Galaxies of Three Gamma-Ray Bursts
• Absorption in Gamma Ray Burst afterglows
• Very high column density and small reddening towards GRB 020124 at z = 3.20
• Time-Dependent Photoionization in a Dusty Medium II: Evolution of Dust Distributions and Optical Opacities
• Gamma-Ray Burst in a Molecular Cloud: Destruction of Dust and H2, and Emergent Spectrum
• Dust Depletion and Extinction in a Gamma-Ray Burst Afterglow
• Time-Dependent Photoionization in a Dusty Medium I: Code Description and General Results
• Optical and near-infrared observations of the GRB020405 afterglow
• Discovery of GRB 020405 and its Late Red Bump
• The Discovery and Broad-band Follow-up of the Transient Afterglow of GRB 980703
• A comparative study of the X-ray afterglow properties of optically bright and dark GRBs
• The Strongly Polarized Afterglow of GRB 020405
• GRB010222: afterglow emission from a rapidly decelerating shock
• The Broadband Afterglow of GRB980329
• A Radio Flare from GRB 020405: Evidence for a Uniform Medium Around a Massive Stellar Progenitor
• Colors and luminosities of the optical afterglows of the gamma-ray bursts
• Polarization Evolution of the GRB 020405 Afterglow
• High Resolution Grating Spectroscopy of GRB 020405 with CHANDRA LETGS
• The supernova associated with GRB 020405

Cited by in corpus (30)

• Signatures of Extragalactic Dust in pre-Swift GRB Afterglows
• GRBs as Cosmological Probes - Cosmic Chemical Evolution
• Gamma Ray Bursts as standard candles to constrain the cosmological parameters
• A log N(HI) = 22.6 DLA in a dark gamma-ray burst: the environment of GRB 050401
• Dust and Metal Column Densities in Gamma-Ray Burst Host Galaxies
• The Troublesome Broadband Evolution of GRB 061126: Does a Grey Burst Imply Grey Dust?
• The Dust Extinction Curves of Gamma-Ray Burst Host Galaxies
• Dust properties at z=6.3 in the host galaxy of GRB 050904
• Gamma-Ray Burst afterglows as probes of environment and blastwave physics I: absorption by host galaxy gas and dust
• Evidence for Supernova-Synthesised Dust from the Rising Afterglow of GRB 071025 at z~5
• The Dark Bursts population in a complete sample of bright Swift Long Gamma-Ray Bursts
• The prompt optical/near-infrared flare of GRB 050904: the most luminous transient ever detected
• On Dust Extinction of Gamma-ray Burst Host Galaxies
• Selection effects shaping the Gamma Ray Burst redshift distributions
• Dust Extinction of Gamma-ray Burst Host Galaxies: Identification of Two Classes?
• When Do Internal Shocks End and External Shocks Begin? Early-Time Broadband Modelling of GRB 051111
• Probing Cosmic Dust of the Early Universe through High-Redshift Gamma-Ray Bursts
• Outliers from the mainstream: how a massive star can produce a gamma-ray burst
• Optical afterglow luminosities in the Swift epoch: confirming clustering and bimodality
• The cosmic build-up of dust and metals. Accurate abundances from GRB-selected star-forming galaxies at $1.7<z<6.3$
• Determining the Dust Extinction of Gamma-ray Burst Host Galaxies: A Direct Method Based on Optical and X-ray Photometry
• An infrared ring around the magnetar SGR 1900+14
• A Direct Measurement of the Dust Extinction Curve in an Intermediate-Redshift Galaxy
• Testing Blandford-Znajek mechanism in black hole hyperaccretion flows for long-duration gamma-ray bursts
• Grey Milky Way Extinction from SDSS Stellar Photometry
• Probing the ambient medium of GRB 090618 with XMM-Newton observations
• Optical afterglows of gamma-ray bursts: a bimodal distribution?"
• Gamma-ray burst afterglows : luminosity clustering at infrared wavelengths?
• GRB 100614A and GRB 100615A: two extremely dark GRBs
• Probing the very high redshift Universe with Gamma-ray Bursts: prospects for observations with future X-ray instruments