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Color indices of optical afterglows of long GRBs in the Swiftera

Published online by Cambridge University Press:  22 July 2013

V. Šimon ,
G. Pizzichini  and
R. Hudec
V. Šimon
Affiliation:
Astronomical Institute, AS CR, 25165 Ondřejov, Czech Republic Czech Technical University in Prague, FEL, Prague, Czech Republic
G. Pizzichini
Affiliation:
INAF/IASF Bologna, via Gobetti 101, 40129 Bologna, Italy
R. Hudec
Affiliation:
Astronomical Institute, AS CR, 25165 Ondřejov, Czech Republic Czech Technical University in Prague, FEL, Prague, Czech Republic
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Abstract

We show the power of the method of the color indices that uses the commonly availablemultiband photometry of optical afterglows (OAs) of long GRBs detected bySwift. Our study shows that for most OAs, in the observer frame, thesecolors, corrected for the Galactic reddening, display prominent clustering in thecolor-color diagrams. The color indices enable us to distinguish OAs from other types ofobjects even without available gamma-ray emission. The color-color diagrams can be used toassess the extinction inside the host galaxy. Our approach is also generally important forinvestigating the numerous faint OAs for which obtaining spectra with good S/N ratio isoften impossible.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 61: Gamma-ray Bursts: 15 Years of GRB Afterglows – Progenitors, Environments and Host Galaxies from the Nearby to the Early Universe , 2013 , pp. 271 - 273
Copyright
© EAS, EDP Sciences 2013

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