Colors of optical afterglows of GRBs in analysis of the dust in their environment

Details Colors of optical afterglows of GRBs in analysis of the dust in their environment Colors of optical afterglows of GRBs in analysis of the dust in their environment

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..836..361s&link_type=abstract

GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 361-

Astronomy and Astrophysics

Astrophysics

1

Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

We find that the behaviour of the color indices of the optical afterglows (OAs) of GRBs can be divided into several intervals during the first several tens of days. We present an analysis of the color variations in the very early phases of the OAs and their relation to those of the ensemble of 25 OAs studied by [8]. Our analysis of the Swift/UVOT observations of the very early phase of the OA of GRB050922C reveals chromatic variations which possibly suggest a multi-component, rapidly varying spectral profile during t - T0 < 0.01 days. The colors of this OA do not show any significant intrinsic extinction and put constraints on the changes of the extinction caused by the GRB and/or its OA. We argue that the ensemble of OAs studied here is not reddened. A very broad range of their redshifts (0.17 < z < 3.5) suggests that these GRBs presumably occur in the different times of the evolution of their host galaxies, and hence in the regions with different metallicity and dust content. Although several mechanisms can play a role, our finding shows that all of them must be able to provide a negligible extinction for the events analysed here. We briefly discuss also the implications for the orphan afterglows.

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