Energetic Fermi/LAT GRB 100414A: energetic and correlations.
URATA Y., HUANG K., YAMAOKA K., TSAI P.P. and TASHIRO M.S.
Abstract (from CDS):
This study presents multi-wavelength observational results for energetic GRB 100414A with GeV photons. The prompt spectral fitting using Suzaku/WAM data yielded spectral peak energies of E srcpeak of 1458.7+132.6_- 106.6_ keV and Eisoof 34.5+2.0_- 1.8_x 1052 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 GRB 100414A follows E srcpeak-Eiso and E srcpeak-Eγcorrelations. The late afterglow revealed a flatter evolution with significant excesses at 27.2 days. The most straightforward explanation for the excess is that GRB 100414A was accompanied by a contemporaneous supernova. The model light curve based on other GRB-SN events is marginally consistent with that of the observed light curve.
gamma-ray burst: general - gamma-ray burst: individual: GRB 100414A