Abstract
Close binary systems consisting of two neutron stars (BNS) emit gravitational waves, that allow them to merge on timescales shorter than Hubble time. It is widely believed, that NS–NS mergers in such systems power short gamma-ray bursts (GRB). Several mechanisms which could lead to electromagnetic energy release prior to a merger have been proposed. We estimate the ability to observe the possible pre-burst emission with telescopes of Spectrum–Roentgen–Gamma. We also investigate first such event, GRB210919A, which fell into the field of view of the SRG telescopes less than two days before the burst.
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ACKNOWLEDGEMENTS
This work is based on the data from Mikhail Pavlinsky ART-XC and eROSITA X-ray instruments on board the SRG observatory. The SRG observatory was built by Roskosmos in the interests of the Russian Academy of Sciences represented by its Space Research Institute (IKI) in the framework of the Russian Federal Space Program, with the participation of the Deutsches Zentrum fur Luft- und Raumfahrt (DLR). The ART-XC team thanks the Russian Space Agency, Russian Academy of Sciences and State Corporation Rosatom for the support of the SRG project and ART-XC telescope and the Lavochkin Association (NPOL) with partners for the creation and operation of the SRG spacecraft (Navigator). The eROSITA X-ray telescope was built by a consortium of German Institutes led by MPE, and supported by DLR. The science data are downlinked via the Deep Space Network Antennae in Bear Lakes, Ussurijsk, and Baykonur, funded by Roskosmos. The eROSITA data used in this work were processed using the eSASS software system developed by the German eROSITA consortium.
Funding
Authors are grateful to referees for critical remarks. This work was supported by the RFBR grant 19-29-11029. Work of KAP (interpretation of the results) was supported by Kazan Federal university program ‘‘Priority-2030’’.
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Mereminskiy, I.A., Lutovinov, A.A., Postnov, K.A. et al. Search for Pre-Burst Emission from Binary Neutron Star Mergers with Spectrum–Roentgen–Gamma. Astron. Lett. 48, 370–375 (2022). https://doi.org/10.1134/S1063773722070064
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DOI: https://doi.org/10.1134/S1063773722070064