Abstract
This study presents multi-wavelength observational results for energetic GRB100414A with GeV photons. The prompt spectral fitting using Suzaku/WAM data yielded spectral peak energies of E peak of 1458.7 +132.6 −106.6 keV and Eiso of 34.5 +2.0 −1.8 × 10 52 erg with z = 1.368. The optical afterglow light curves between 3 and 7 days were effectively fitted according to a simple power law with a temporal index of α = −2.6 ± 0.1. The joint light curve with earlier Swift/UVOT observations yields a temporal break at 2.3±0.2 days. This was the first Fermi /LAT detected event that demonstrated the clear temporal break in the optical afterglow. The jet opening angle derived from this temporal break was 5.8, consistent with those of other well-observed long gamma-ray bursts (GRBs). The multi-wavelength analyses in this study showed that GRB100414A follows E peak − Eiso and E src peak − Eγ correlations. The late afterglow revealed a flatter evolution with significant excesses at 27.2 days. The most straightforward explanation for the excess is that GRB100414A was accompanied by a contemporaneous supernova. The model light curve based on other GRB−SN events is marginally consistent with that of the observed lightcurve. Subject headings: Gamma-ray burst: individual
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