tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for useful comments. R.G. and J.G. are supported by the Israeli Science Foundation under grant No. 719/14 and by the ISF-NSFC joint research program (grant No. 3296/19). We thank Merlin Kole for organizing and the hospitality at the conference Shedding new light on Gamma-Ray Bursts with polarization data in Geneva where part of this work was completed.
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