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2023ApJ...943..181L - Astrophys. J., 943, 181 (2023/February-1)

Three-stage Collapse of the Long Gamma-Ray Burst from GRB 160625B Prompt Multiwavelength Observations.

LIPUNOV V.M., SADOVNICHY V.A., PANASYUK M.I., YASHIN I.V., SVERTILOV S.I., SIMAKOV S.G., SVINKIN D., GORBOVSKOY E., LIPUNOVA G.V., KORNILOV V.G., FREDERIKS D., TOPOLEV V., REBOLO R., SERRA M., TIURINA N., MINKINA E., BOGOMOLOV V.V., BOGOMOLOV A.V., IYUDIN A.F., CHASOVNIKOV A., GABOVICH A., TSVETKOVA A., BUDNEV N.M., GRESS O.A., ANTIPOV G., GORBUNOV I., VLASENKO D., BALANUTSA P., PODESTA R., ZHIRKOV K., KUZNETSOV A., VLADIMIROV V., PODESTA F., FRANCILE C., SERGIENKO Y., TLATOV A., ERSHOVA O., CHERYASOV D., YURKOV V. and KRYLOV A.V.

Abstract (from CDS):

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.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gamma-ray bursts - Black holes - Neutron stars

Simbad objects: 7

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