@article{hascoet:insu-03645716, TITLE = {{Estimates for Lorentz Factors of Gamma-Ray Bursts from Early Optical Afterglow Observations}}, AUTHOR = {Hasco{\"e}t, Romain and Beloborodov, Andrei M. and Daigne, Fr{\'e}d{\'e}ric and Mochkovitch, Robert}, URL = {https://insu.hal.science/insu-03645716}, JOURNAL = {{The Astrophysical Journal}}, PUBLISHER = {{American Astronomical Society}}, VOLUME = {782}, YEAR = {2014}, DOI = {10.1088/0004-637X/782/1/5}, KEYWORDS = {gamma-ray burst: general ; Astrophysics - High Energy Astrophysical Phenomena}, HAL_ID = {insu-03645716}, HAL_VERSION = {v1}, }