GRB 991216 Joins the Jet Set : Discovery and Monitoring of its Optical

@inproceedings{Halpern2000GRB9J,
  title={GRB 991216 Joins the Jet Set : Discovery and Monitoring of its Optical},
  author={Jules P. Halpern and Robert R. Uglesich and N. Mirabal and S. Kassin and J R Thorstensen and William C. Keel and Alan H. Diercks and Joshua S. Bloom and Fiona H. Harrison and J W Mattox and Mike Eracleous},
  year={2000}
}
The optical light curve of the energetic γ-ray burst GRB 991216 is consistent with jetlike behavior in which a power-law decay steepens from t−1.22±0.04 at early times to t−1.53±0.05 in a gradual transition at around 2 d. The derivation of the late-time decay slope takes into account the constant contribution of a host or intervening galaxy which was measured 110 days after the event at R = 24.56 ± 0.14, although the light curve deviates from a single power law whether or not a constant term is… CONTINUE READING

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