Publications (57)
Fermi-GBM Discovery of GRB 221009A: An Extraordinarily Bright GRB from Onset to Afterglow
S. Lesage, P. Veres, M. S. Briggs +136
We report the discovery of GRB 221009A, the highest flux gamma-ray burst ever observed by the Fermi Gamma-ray Burst Monitor (GBM). This GRB has continuous prompt emission lasting m…
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…
Unraveling the Origins of GRB X-ray Plateaus through a Study of X-ray Flares
H. Dereli-Bégué, A. Pe'er, D. Bégué +1
The X-ray light curves of gamma-ray bursts (GRBs) display complex features, including plateaus and flares, that challenge theoretical models. Here, we study the properties of flare…
VHE gamma-ray emission of PKS 2155-304: spectral and temporal variability
HESS Collaboration, A. Abramowski, F. Acero +185
Observations of very high energy gamma-rays from blazars provide information about acceleration mechanisms occurring in their innermost regions. Studies of variability in these obj…
Identification and properties of the photospheric emission in GRB090902B
F. Ryde, M. Axelsson, B. B. Zhang +19
The Fermi Gamma-ray Space Telescope observed the bright and long GRB090902B, lying at a redshift of z = 1.822. Together the Large Area Telescope (LAT) and the Gamma-ray Burst Monit…
Principal Component Analysis of Gamma-Ray Bursts' Spectra
Z. Bagoly, I. Horvath, L. G. Balazs +4
Principal component analysis is a statistical method, which lowers the number of important variables in a data set. The use of this method for the bursts' spectra and afterglows is…