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tokens: We are grateful to Ilia Potravnov for a number of useful comments and to the Swift team for the execution of our ToO request. This work was supported by the Russian Science Foundation grant 14-12-01287 (S.S.T., A.A.M., A.A.L., V.S.), the Academy of Finland grant 268740, and the National Science Foundation grant PHY-1125915 (J.P.). V.D. thanks the Deutsches Zentrums for Luft- und Raumfahrt (DLR) and the DFG for financial support (grant DLR 50 OR 0702). We also acknowledge the support of COST Action MP1304.