Three-stage Collapse of the Long Gamma-Ray Burst from GRB 160625B Prompt Multiwavelength Observations
Rebolo, R.; Lipunov, V. M.; Kornilov, V. G.; Zhirkov, K.; Gorbovskoy, E.; Budnev, N. M.; Podesta, R.; Yurkov, V.; Gabovich, A.; Balanutsa, P.; Gorbunov, I.; Vlasenko, D.; Topolev, V.; Kuznetsov, A.; Vladimirov, V.; Chasovnikov, A.; Minkina, E.; Svertilov, S. I.; Podesta, F.; Tlatov, A.; Svinkin, D.; Bogomolov, A. V.; Iyudin, A. F.; Frederiks, D.; Ershova, O.; Antipov, G.; Cheryasov, D.; Francile, C.; Tiurina, N.; Tsvetkova, A.; Sadovnichy, V. A.; Panasyuk, M. I.; Yashin, I. V.; Simakov, S. G.; Lipunova, G. V.; Serra, M.; Bogomolov, V. V.; Gress, O. A.; Sergienko, Yu.; Krylov, A. V.
Russia, Spain, Argentina
Abstract
This article presents the early results of synchronous multiwavelength observations of one of the brightest gamma-ray bursts (GRBs) GRB 160625B with the detailed continuous fast optical photometry of its optical counterpart obtained by MASTER and with hard X-ray and gamma-ray emission, obtained by the Lomonosov and Konus-Wind spacecraft. The detailed photometry led us to detect the quasi-periodical emission components in the intrinsic optical emission. As a result of our analysis of synchronous multiwavelength observations, we propose a three-stage collapse scenario for this long and bright GRB. We suggest that quasiperiodic fluctuations may be associated with forced precession of a self-gravitating rapidly rotating superdense body (spinar), whose evolution is determined by a powerful magnetic field. The spinar's mass allows it to collapse into a black hole at the end of evolution.