Energetic Fermi/LAT GRB 100414A: Energetic and Correlations
Abstract
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 src peak of 1458.7+132.6 - 106.6 keV and E iso of 34.5+2.0 - 1.8 × 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 5fdg8, 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 src peak-E iso and E src peak-E γ correlations. 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.
- Publication:
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The Astrophysical Journal
- Pub Date:
- March 2012
- DOI:
- 10.1088/2041-8205/748/1/L4
- arXiv:
- arXiv:1202.6440
- Bibcode:
- 2012ApJ...748L...4U
- Keywords:
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- gamma-ray burst: general;
- gamma-ray burst: individual: GRB 100414A;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- ApJL in press