Discovery of Early Optical Emission from GRB021004 and GRB021211

Details Discovery of Early Optical Emission from GRB021004 and GRB021211 Discovery of Early Optical Emission from GRB021004 and GRB021211

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.4403f&link_type=abstract

American Astronomical Society, HEAD meeting #7, #44.03; Bulletin of the American Astronomical Society, Vol. 35, p.656

Astronomy and Astrophysics

Astronomy

Scientific paper

We present our discovery of early-time optical emission from two recent gamma-ray bursts, GRB 021004 and GRB 021211. The prompt observations of these bursts are the first such observations since GRB 990123, and in both cases, allow the identification of the reverse-shock component of the afterglow emission. In GRB 021004, the initial decline is unexpectedly slow, which has intriguing implications for the nature of the central engine in this burst. For GRB 021211, the reverse shock is not detected in the radio, to an upper limit of 110 μ Jy at 8.46 GHz, implying either that the Lorentz factor of the burst γ < ˜ 200, or that synchrotron self-absorption effects dominate the radio emission at this time. With a sample of three early-time GRB afterglows we are beginning to sample the range of behaviors on these timescales, corresponding to ejecta Lorentz factors γ ≳ 100 and length scales r< ˜ 1018 cm.

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