English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present an optical-to-X-ray spectral analysis of the afterglow of GRB020405. The optical spectral energy distribution not corrected for theextragalactic extinction is significantly below the X-ray extrapolation of thesingle powerlaw spectral model suggested by multiwavelength studies. Weinvestigate whether considerable extinction could explain the observed spectral``mismatch'' by testing several types of extinction curves. For the first timewe test extinction curves computed with time-dependent numerical simulations ofdust grains destruction by the burst radiation. We find that an extinction lawweakly depen dent on wavelength can reconcile the unabsorbed optical and X-raydata with the expected synchrotron spectrum. A gray extinction law can beprovided by a dust grain size distribution biased toward large grains.Comment: 6 pages, 5 figures, accepted for publication on A&

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