Abstract
We acknowledge the anonymous referee for helpful comments and suggestions. We also thank Bing Zhang and He Gao for helpful discussions. This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. This study was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB23040400). SLX was also supported by the Hundred Talents Program of the Chinese Academy of Sciences (Grant No. Y629113). WHL and WC acknowledge support from the National Natural Science Foundation of China (Grant U1431124). BBZ acknowledges support from the Spanish Ministry Projects AYA2012-39727-C03-01 and AYA201571718-R. LMS acknowledges support from the National Program on Key Research and Development Project (Grant No. 2016YFA0400801) and the National Basic Research Program of China (Grant No. 2014CB845802).
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