VizieR Online Data Catalog: Model for subphotospheric dissipation in GRBs (Ahlgren+, 2019)
Abstract
We have considered a model for subphotospheric dissipation as the origin of GRB prompt emission and fitted it to Fermi GRB data. Our sample contains the brightest GRBs with known redshifts observed by Fermi (Bhat et al. 2016ApJS..223...28B, Cat. J/ApJS/223/28) before 2016-06-01. The known redshift1 helps us fix the normalization parameter of the model spectrum via the corresponding luminosity distance, instead of leaving it as a free parameter. This is important because we want to be able to test the model's ability to correctly predict the GRB flux. We chose a fluence cut of >10-5erg/cm2, in order to allow ourselves to perform a time-resolved analysis with good signal strength.
The dissipation is localized and we assume internal shocks as the dissipation mechanism. Additionally, the model does not take into account geometric effects, a fuzzy photosphere, or jet hydrodynamics. We consider the scenario where there are no significant magnetic fields presents. A table model, DREAM1.2, was created from simulations using the numerical code of Pe'er & Waxman (2005ApJ...628..857P). Using DREAM1.2, we performed a time-resolved analysis of 36 bursts, using Bayesian blocks as a binning method. We analysed a total of 634 time-resolved spectra. Out of these, we find that 171 spectra are well described by our model, passing the GOF test and having no parameters on the boundaries of the parameter space. This corresponds to an acceptance rate of about 27 per cent, with 10 bursts having at least 50 per cent accepted fits. (1 data file).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- September 2022
- Bibcode:
- 2022yCat..74850474A
- Keywords:
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- GRB;
- Models