Revealing the Jet Structure of GRB 030329 with High-Resolution Multicolor Photometry

  title={Revealing the Jet Structure of GRB 030329 with High-Resolution Multicolor Photometry},
  author={Javier Gorosabel and Alberto J. Castro-Tirado and Enrico Ramirez-Ruiz and Jonathan Granot and Nicola Caon and Luz Marina Cair{\'o}s and Eduardo Rubio-Herrera and Sergei S. Guziy and Antonio de Ugarte Postigo and M. Jelinek Iaacsic and Spain Ias and Princenton and Usa Kipac and Standford and Usa Iac and Spain Inst. Anton Pannekoek and Nl},
  journal={The Astrophysical Journal},
We present multicolor optical observations of the nearby (z = 0.1685) GRB030329 obtained with the same instrumentation over a time period of 6 hours for a total of an unprecedented 475 quasi-simultaneous B V R observations. The achromatic steepening in the optical, which occurs at t {approx} 0.7 days, provides evidence for a dynamic transition of the source, and can be most readily explained by models in which the GRB ejecta are collimated into a jet. Since the current state-of-the-art modeling… 

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