GRB 110213A: A Study of Afterglow Electromagnetic Cascade Radiation

Abstract We obtained well-sampled optical photometry of GRB 110213A, including Swift/UVOT and XRT. Combining our data from those other ground-based telescopes, we present 15 multicolor light curves showing similar shapes with two peaks. In contrast, in the X-ray band, only a single peak is observed between Temporal spectral analysis 110213A shows that X-rays differ for Phases I–III (before second band at ∼5.6 ks). Moreover, they have same behavior late times (Phases IV–VI). These indicate emission are dominated by different components. The synchrotron-supported pair cascade included standard external forward-shock model, which synchrotron radiation self-Compton (SSC). find bands + SSC early stage, while primary dominates band. At stages, both radiation. component can reasonably explain first peak. mainly contributes to