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Implications of early time observations of optical afterglowsof GRBs

Published online by Cambridge University Press:  22 July 2013

S.B. Pandey  and
W. Zheng
S.B. Pandey
Affiliation:
ARIES, Manora Peak, Nainital 263129, Uttarakhand, India
W. Zheng
Affiliation:
Randall Laboratory of Physics, University of Michigan, 450 Church Street, Ann Arbor, MI 48109-1040, USA
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Abstract

Optical observations of afterglows at very times are very useful towards understandingthe least known problem of GRB research field i.e. the transition fromprompt emission to early afterglows. The comparison of a subset of well-monitored GRBs andtheir early time properties at optical are compared with that seen at XRT and BATwavelengths. In most of the observed cases, the very early optical observations of GRBs donot trace the canonical decay nature seen at XRT wavelengths, suggesting different originsfor the observed early emissions in the two bands. In some of the early opticallight-curves, the decay followed by smooth rise features are consistent with the onset ofthe afterglow although such features are also expected if the emission is seen off-axisand/or the outflow is structured.

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. 203 - 209
Copyright
© EAS, EDP Sciences 2013

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