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Synchrotron emission in GRBs observed by Fermi: Its limitations and the role of the photosphere
S. Iyyani, F. Ryde, J. M. Burgess +2
It has been suggested that the prompt emission in gamma-ray bursts consists of several components giving rise to the observed spectral shape. Here we examine a sample of the 8 brig…
The Multi-Mission Maximum Likelihood framework (3ML)
Giacomo Vianello, Robert J. Lauer, Patrick Younk +7
Astrophysical sources are now observed by many different instruments at different wavelengths, from radio to high-energy gamma-rays, with an unprecedented quality. Putting all thes…
An External Shock Origin of GRB
J. Michael Burgess, Damien Bégué, Felix Ryde +4
The prompt emission of the long, smooth, and single-pulsed gamma-ray burst, GRB , is analyzed under the guise of an external shock model. First, we fit the -ra…
Extremely narrow spectrum of GRB110920A: further evidence for localised, subphotospheric dissipation
S. Iyyani, F. Ryde, B. Ahlgren +6
Much evidence points towards that the photosphere in the relativistic outflow in GRBs plays an important role in shaping the observed MeV spectrum. However, it is unclear whether t…
Evidence for jet launching close to the black hole in GRB 101219B - a Fermi GRB dominated by thermal emission
J. Larsson, J. L. Racusin, J. M. Burgess
We present observations by the Fermi Gamma-Ray Space Telescope Gamma-Ray Burst Monitor (GBM) of the nearby (z=0.55) GRB 101219B. This burst is a long GRB, with an associated supern…