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Session 33 - Gamma-ray Burst Counterparts and Afterglows.
Topical, Oral session, Tuesday, June 09

[33.07] Multi-wavelength studies of GRB afterglows

T. J. Galama, P. J. Groot, P. Vreeswijk (U. Amsterdam, The Netherlands), J. van Paradijs (U. Alabama in Huntsville and U. Amsterdam), R. Wijers, N. Tanvir (IoA, Cambridge, UK), C. Kouveliotou, C. Robinson (USRA at NASA/MSFC), M. Bremer (IRAM, France)

We present multi-wavelength observations of several gamma-ray burst afterglows: (i) the optical light curves of GRB 970228, GRB 970508 and GRB 980326; (ii) the GRB 970508 radio 1.4 GHz and mm (86 GHz) lightcurves, and (iii) the X-ray to radio spectrum of GRB 970508 on May 21 (12.1 days after trigger). A successful and consistent description of afterglow observations is given by a blast wave model, in which a significant fraction of the electrons cool rapidly. For GRB 970508 it succesfully describes the observations ranging in time from trigger until several months later, over 9 decades in frequency from radio to X rays.

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