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GRB 090417B and its host galaxy: a step toward an understanding of optically dark gamma-ray bursts
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2010 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 717, no 1, 223-234 p.Article in journal (Refereed) Published
Abstract [en]

GRB 090417B was an unusually long burst with a T-90 duration of at least 2130 s and a multi-peaked light curve at energies of 15-150 keV. It was optically dark and has been associated with a bright star-forming galaxy at a redshift of 0.345 that is broadly similar to the Milky Way. This is one of the few cases where a host galaxy has been clearly identified for a dark gamma-ray burst (GRB) and thus an ideal candidate for studying the origin of dark bursts. We find that the dark nature of GRB 090417B cannot be explained by high redshift, incomplete observations, or unusual physics in the production of the afterglow. Assuming the standard relativistic fireball model for the afterglow we find that the optical flux is at least 2.5 mag fainter than predicted by the X-ray flux. The Swift/XRT X-ray data are consistent with the afterglow being obscured by a dense, localized sheet of dust approximately 30-80 pc from the burst along the line of sight. Our results suggest that this dust sheet imparts an extinction of A(V) greater than or similar to 12 mag, which is sufficient to explain the missing optical flux. GRB 090417B is an example of a GRBs that is dark due to the localized dust structure in its host galaxy.

Place, publisher, year, edition, pages
2010. Vol. 717, no 1, 223-234 p.
Keyword [en]
dust, extinction, galaxies: individual (SDS J135846.65+470104), gamma-ray burst: individual (GRB 090417B)
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-136288DOI: 10.1088/0004-637X/717/1/223ISI: 000278777900018OAI: oai:DiVA.org:uu-136288DiVA: diva2:376535
Available from: 2010-12-11 Created: 2010-12-11 Last updated: 2010-12-11Bibliographically approved

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