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000586748 1001_ $$0P:(DE-HGF)0$$aAnderson, Gemma$$b0$$eCorresponding author
000586748 245__ $$aRapid radio brightening of GRB 210702A
000586748 260__ $$aOxford$$bOxford Univ. Press$$c2023
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000586748 520__ $$aWe observed the rapid radio brightening of GRB 210702A with the Australian Telescope Compact Array (ATCA) just 11hr post-burst, tracking early-time radio variability over a 5hr period on ~15min timescales at 9.0, 16.7, and 21.2GHz. A broken power-law fit to the 9.0GHz light curve showed that the 5hr flare peaked at a flux density of 0.4+/-0.1mJy at ~13hr post-burst with a steep rise and decline. The observed temporal and spectral evolution are not expected in the standard internal-external shock model, where forward and reverse shock radio emission evolves on much longer timescales. The early-time (<1day) optical and X-ray light curves from the Neil Gehrels Swift Observatory demonstrated typical afterglow forward shock behaviour, allowing us to use blast wave physics to determine a likely homogeneous circumburst medium and an emitting electron population power-law index of p=2.9+/-0.1. We suggest the early-time radio flare is likely due to weak interstellar scintillation (ISS), which boosted the radio afterglow emission above the ATCA sensitivity limit on minute timescales. Using weak ISS relations, we were able to place an upper limit on the size of the blast wave of $\leq6 \times 10^{16}$cm in the plane of the sky, which is consistent with the theoretical forward shock size prediction of $8\times10^{16}$cm for GRB 210702A at ~13h post-burst. This represents the earliest ISS size constraint on a GRB blast wave to date, demonstrating the importance of rapid (<1day) radio follow-up of GRBs using several-hour integrations to capture the early afterglow evolution, and to track scintillation over a broad frequency range.
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000586748 7001_ $$aRussell, T. D.$$b1
000586748 7001_ $$aFausey, H. M.$$b2
000586748 7001_ $$avan der Horst, A. J.$$b3
000586748 7001_ $$aHancock, P. J.$$b4
000586748 7001_ $$aBahramian, A.$$b5
000586748 7001_ $$aBell, M. E.$$b6
000586748 7001_ $$aMiller-Jones, J. C. A.$$b7
000586748 7001_ $$aRowell, G.$$b8
000586748 7001_ $$aSammons, M. W.$$b9
000586748 7001_ $$aWijers, R. A. M. J.$$b10
000586748 7001_ $$aGalvin, T. J.$$b11
000586748 7001_ $$aGoodwin, A. J.$$b12
000586748 7001_ $$0P:(DE-H253)PIP1084239$$aKonno, R.$$b13
000586748 7001_ $$aRowlinson, A.$$b14
000586748 7001_ $$aRyder, S. D.$$b15
000586748 7001_ $$aSchussler, F.$$b16
000586748 7001_ $$aWagner, S. J.$$b17
000586748 7001_ $$0P:(DE-H253)PIP1089041$$aZhu, S. J.$$b18
000586748 773__ $$0PERI:(DE-600)2016084-7$$a10.1093/mnras/stad1635$$gVol. 523, no. 4, p. 4992 - 5005$$n4$$p4992 - 5005$$tMonthly notices of the Royal Astronomical Society$$v523$$x0035-8711$$y2023
000586748 7870_ $$0PUBDB-2023-04030$$aAndersson, Gabriella et.al.$$d2023$$iIsParent$$rarXiv:2211.11212$$tRapid radio brightening of GRB 210702A
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