Infrared afterglow of GRB041219 as a result of reradiation on dust in a circumstellar cloud

Details Infrared afterglow of GRB041219 as a result of reradiation on dust in a circumstellar cloud Infrared afterglow of GRB041219 as a result of reradiation on dust in a circumstellar cloud

2005-03-18

arxiv.org/abs/astro-ph/0503414v1

Astrofiz. 48 (2005) 439-444; Astrophysics 48 (2005) 369-373

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, Submited to Astrofizika

Scientific paper

10.1007/s10511-005-0035-2

Observations of gamma ray bursts (GRB) afterglows in different spectral bands provide a most valuable information about their nature, as well as about properties of surrounding medium. Powerful infrared afterglow was observed from the strong GRB041219. Here we explain the observed IR afterglow in the model of a dust reradiation of the main GRB signal in the envelope surrounding the GRB source. In this model we do not expect appearance of the prompt optical emission which should be absorbed in the dust envelope. We estimate the collimation angle of the gamma ray emission, and obtain restrictions on the redshift (distance to GRB source), by fitting the model parameters to the observational data.

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