SCUBA sub-millimeter observations of gamma-ray bursts
III. GRB 030329: The brightest sub-millimeter afterglow to date
Smith, I. A., Tilanus, R. P. J., Tanvir, N., Wijers, R. A. M. J.,
Vreeswijk, P., Rol, E., & Kouveliotou, C.
We present all the Target of Opportunity (ToO) sub-millimeter
observations of GRB 030329 taken by the Sub-millimetre Common-User
Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT).
This was by far the brightest sub-millimeter afterglow seen to date.
The flux density at 850 microns was approximately constant up to a
break that took place approximately 7 days after the burst.
This was consistent with being a jet break.
The 850 micron results agree with those at longer wavelengths that
show a brighter flux approximately 7 days after the burst, right at
the time of the break.
No short-lived large-scale brightenings were detected in the
sub-millimeter light curve.
However, the 850 micron light curve may have had a drop < 16 days
after the burst.
The peak of the afterglow emission was at ~90 GHz in the days before
the break in the light curve.
A simple modeling is consistent with the spectral indices remaining
the same as the afterglow evolved, with the breaks in the spectrum
moving to longer wavelengths at later times and the flux at the peak
falling.
No significant sub-millimeter emission was detected from the host galaxy.
Status: Published 2005, A&A, 439, 981.
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