1. Rapid radio brightening of GRB 210702A
- Author
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Andersson, Gabriella, Russell, T. D., Fausey, H. M., van der Horst, A. J., Hancock, P. J., Bahramian, A., Bell, M. E., Miller-Jones, J. C. A., Rowell, G., Sammons, M. W., Wijers, R. A. M. J., Galvin, T. J., Goodwin, A. J., Konno, R., Rowlinson, A., Ryder, S. D., Schussler, F., Wagner, S. J., and Zhu, S. J.
- Abstract
We observed the rapid radio brightening of GRB 210702A with the Australian Telescope Compact Array (ATCA) just 11hr post-burst, tracking early-time radio variability over a 5hr period on ~15min timescales at 9.0, 16.7, and 21.2GHz. A broken power-law fit to the 9.0GHz light curve showed that the 5hr flare peaked at a flux density of 0.4+/-0.1mJy at ~13hr post-burst with a steep rise and decline. The observed temporal and spectral evolution are not expected in the standard internal-external shock model, where forward and reverse shock radio emission evolves on much longer timescales. The early-time (
- Published
- 2023
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