Multi-wavelength Study of GRB 060906

Details Multi-wavelength Study of GRB 060906 Multi-wavelength Study of GRB 060906

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21361003r&link_type=abstract

American Astronomical Society, AAS Meeting #213, #610.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a multi-wavelength study of the afterglow emission from GRB 060906 using optical and X-ray data. GRB 060906 was a moderately high redshift (z = 3.685), long duration burst (T90=43.6 s) detected by Swift. Optical observations with the robotic Palomar 60-inch telescope started 12 minutes after the burst, whereas X-ray observations with the Swift began at 148 sec after the burst. Both the observations continued until the event faded below detection, approximately two days after the event. The optical light curve shows a clear rebrightening, by about 1 mag, at 167 min after the burst in R, I', g', and z’ bands. The X-ray light curve also indicates rebrightening around same time as optical band, although a data gap in the X-ray light curve makes it less obvious compared to the optical. Several mechanisms have been proposed to explain rebrightening in GRB afterglows, including a two-component jet, a refreshed-shock, and sudden density jump in the circumburst environment. In this paper we present the X-ray and optical lightcurves and discuss them in the context of predicted deviations from standard afterglow theory.

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