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SUMMARY:Oscar Wistemar: Investigating GRB prompt emission with a photosphe
 ric model based on radiation-mediated shocks
DTSTART:20260430T111500Z
DTEND:20260430T120000Z
DTSTAMP:20260608T115700Z
UID:indico-event-9565@indico.fysik.su.se
DESCRIPTION:We use a photospheric framework to interpret the gamma-ray bur
 st prompt emission from the relativistic jet. The framework is based on ra
 diation-mediated shocks dissipating energy below the photosphere. We use t
 he Kompaneets RMS approximation (KRA) model\, which is an RMS analog\, to 
 fit the main emission episode of GRB 211211A. The KRA model fits well for 
 the entire main emission and captures the low-energy break (or curvature) 
 in the spectra. The properties of the shock show that there is a strong sh
 ock occurring in a hot upstream at low to moderate optical depths. We also
  introduce a method to estimate properties of the jet outflow and find tha
 t the bulk outflow Lorentz factor of the jet is ~250 during the main emiss
 ion and that the jet is most likely pair loaded\, potentially from sideway
 s diffusion of a neutron wind. In conclusion\, photospheric emission alter
 ed by an RMS can explain the observations of GRB211211A and the KRA model 
 can fit its spectra well\, including the additional curvature at energies 
 below the peak (i.e. a low-energy break).\n\nhttps://indico.fysik.su.se/ev
 ent/9565/
LOCATION:A5:1003 (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9565/
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