Optical light curve and cooling break of GRB 050502A

Abstract

We present light curves of the afterglow of GRB 050502A, including very early data at t - t(GRB) < 60 s. The light curve is composed of unfiltered ROTSE-IIIb optical observations from 44 s to 6 hr postburst, R-band MDM observations from 1.6 to 8.4 hr postburst, and PAIRITEL JHKs observations from 0.6 to 2.6 hr postburst. The optical light curve is fit by a broken power law, where t(alpha) steepens from alpha = 1.13 +/- 0.02 to -1.44 +/- 0.02 at similar to 5700s. This steepening is consistent with the evolution expected for the passage of the cooling frequency v(c) through the optical band. Even in our earliest observation at 44 s postburst, 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 sigma with the observed spectral index beta = -0.8 +/- 0.1; the wind interpretation would imply a spectral index slightly (similar to 2 sigma) shallower 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 beta. In this picture, the early optical decay, with the peak at or below 4.7 x 10(14) Hz at 44 s, requires very small electron and magnetic energy partitions from the fireball.