Optical Lightcurve and Cooling Break
of GRB 050502A

S. A. Yost, et al.,
Astrophys. Journal, 636, 959 (2006)

Abstract

We present light curves of the afterglow of GRB 050502A, including very early data at t - t_GRB < 60 s. The lightcurve is composed of unfiltered ROTSE-IIIb optical observations from 44 s to 6 h post-burst, R-band MDM observations from 1.6 to 8.4 h post-burst, and PAIRITEL JHK_s observations from 0.6 to 2.6 h post-burst. The optical lightcurve is fit by a broken power law, where t steepens from = -1.13 +/- 0.02 to = -1.44 +/- 0.02 at ~ 5700 s. This steepening is consistent with the evolution expected for the passage of the cooling frequency through the optical band. Even in our earliest observation at 44 s post-burst, there is no evidence that the optical flux is brighter than a backward extrapolation of the later power law would suggest. The observed decay indices and spectral index are consistent with either an ISM or a Wind fireball model, but slightly favor the ISM interpretation. The expected spectral index in the ISM interpretation is consistent within 1  with the observed spectral index ß = -0.8 +/- 0.1; the Wind interpretation would imply a slightly (~ 2 ) shallower spectral index than observed. A small amount of dust extinction at the source redshift could steepen an intrinsic spectrum sufficiently to account for the observed value of ß. In this picture, the early optical decay, with the peak at or below 4.7×10¹⁴ Hz at 44 s, requires very small electron and magnetic energy partitions from the fireball.

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