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The X-ray afterglow plateau emission observed in many Gamma-ray Bursts (GRBs) has been interpreted as either being fueled by fallback onto a newly formed black hole, or by the spin-down luminosity of an ultra-magnetized millisecond neutron…

High Energy Astrophysical Phenomena · Physics 2018-12-26 G. Stratta , M. G. Dainotti , S. Dall'Osso , X. Hernandez , G. De Cesare

Many long-duration gamma-ray bursts (GRBs) were observed by {\it Swift}/XRT to have plateaus in their X-ray afterglow light curves. This plateau phase has been argued to be evidence for long-lasting activity of magnetar (ultra-strongly…

High Energy Astrophysical Phenomena · Physics 2014-01-09 S. X. Yi , Z. G. Dai , X. F. Wu , F. Y. Wang

Gamma ray bursts (GRBs) have great advantages for their huge burst energies, luminosities and high redshifts in probing the Universe. A few interesting luminosity correlations of GRBs have been used to test cosmology models. Especially, for…

High Energy Astrophysical Phenomena · Physics 2015-05-27 M. Xu , Y. F. Huang

The central engine of gamma-ray bursts (GRBs) remains an open and forefront topic in the era of multimessenger astrophysics. The X-ray plateaus appear in some GRB afterglows, which are widely considered to originate from the spindown of…

High Energy Astrophysical Phenomena · Physics 2021-12-08 Shu-Jin Hou , Shuang Du , Tong Liu , Hui-Jun Mu , Ren-Xin Xu

An intrinsic correlation has been identified between the luminosity and duration of plateaus in the X-ray afterglows of Gamma-Ray Bursts (GRBs; Dainotti et al. 2008), suggesting a central engine origin. The magnetar central engine model…

High Energy Astrophysical Phenomena · Physics 2015-06-22 A. Rowlinson , B. P. Gompertz , M. Dainotti , P. T. O'Brien , R. A. M. J. Wijers , A. J. van der Horst

Many short Gamma-Ray Bursts (sGRBs) have a prolonged plateau in the X-ray afterglow lasting up to tens of thousands of seconds. A central engine injecting energy into the remnant may fuel the plateau. A simple analytic model describing the…

High Energy Astrophysical Phenomena · Physics 2021-11-29 L. C. Strang , A Melatos

Long duration gamma-ray bursts (GRBs) are thought to be produced by the core-collapse of a rapidly-rotating massive star. This event generates a highly relativistic jet and prompt gamma-ray and X-ray emission arises from internal shocks in…

High Energy Astrophysical Phenomena · Physics 2015-05-14 N. Lyons , P. T. O'Brien , B. Zhang , R. Willingale , E. Troja , R. L. C. Starling

Short gamma-ray bursts (GRBs) exhibiting a plateau phase provide valuable insights into the post-merger activity of their central engines. Although the physical origin of the plateau remains uncertain, the magnetar energy injection model…

High Energy Astrophysical Phenomena · Physics 2026-02-24 Chen Deng , Yong-Feng Huang , Abdusattar Kurban , Jin-Jun Geng , Fan Xu , Xiao-Fei Dong , Hao-Xuan Gao , En-Wei Liang , Liang Li

The origin of gamma-ray burst (GRB) X-ray plateau, especially the internal plateau, is still unclear, but it could be related to GRB's central engine of magnetar. It is generally believed that the spin-down power of the magnetar is injected…

High Energy Astrophysical Phenomena · Physics 2020-09-30 Shuang Du

Gamma-ray burst (GRB) X-ray light curves exhibit a variety of complex temporal structures, such as flares and plateaus. The origin of flares seen in many GRB early afterglows is still uncertain. Here, we analyze a sample of 89 GRBs, 61 of…

High Energy Astrophysical Phenomena · Physics 2025-12-09 H. Dereli-Bégué , A. Pe'er , D. Bégué , F. Ryde , A. Gowri

GRB~250704B/EP250704a, identified as a short gamma-ray burst (sGRB), exhibited prolonged X-ray emission following the prompt phase and, in optical and infrared (IR) bands, an unusual one-day plateau succeeded by a rapid decline. This sGRB…

High Energy Astrophysical Phenomena · Physics 2026-01-23 Nissim Fraija , Antonio Galvá , Boris Betancourt Kamenetskaia , Maria G Dainotti

Early X-ray emission of Gamma-Ray Bursts (GRBs) traces the transition between the prompt emission and the afterglow radiation, and its rapid flux decline is often interpreted as the tail of the prompt emission. As such, it can offer…

High Energy Astrophysical Phenomena · Physics 2026-04-08 Annarita Ierardi , Gor Oganesyan , Stefano Ascenzi , Marica Branchesi , Biswajit Banerjee , Samuele Ronchini

The prompt emission, X-ray plateau, and X-ray flares of Gamma-ray bursts (GRB) are thought to be from internal dissipation, and the magnetar as the central engine with propeller fallback accretion is proposed to interpret the observed…

High Energy Astrophysical Phenomena · Physics 2024-01-17 Wen-Yuan Yu , Hou-Jun Lü , Xing Yang , Lin Lan , Zhe Yang

A significant fraction of the Long Gamma-ray Bursts (LGRBs) in the Swift sample have a plateau phase showing evidence of ongoing energy injection. We suggest that many Short Gamma-ray Bursts (SGRBs) detected by the Swift satellite also show…

High Energy Astrophysical Phenomena · Physics 2015-06-12 A. Rowlinson , P. T. O'Brien , B. D. Metzger , N. R. Tanvir , A. J. Levan

A class of long Gamma-Ray Bursts (GRBs) presenting light curves with an extended plateau phase in their X-ray afterglows obeys a correlation between the rest frame end time of the plateau, $T_a$, and its corresponding X-ray luminosity,…

High Energy Astrophysical Phenomena · Physics 2017-02-15 Maria Giovanna Dainotti , Sergey Postnikov , Xavier Hernandez , Michał Ostrowski

A large fraction of Gamma Ray Bursts (GRBs) displays an X-ray plateau phase within <10^{5} s from the prompt emission, proposed to be powered by the spin-down energy of a rapidly spinning newly born magnetar. In this work we use the…

High Energy Astrophysical Phenomena · Physics 2015-11-11 Nanda Rea , Miguel Gullon , Jose' A. Pons , Rosalba Perna , Maria G. Dainotti , Juan A. Miralles , Diego F. Torres

A plateau phase in the X-ray afterglow is observed in a significant fraction of gamma-ray bursts (GRBs). Previously, it has been found that there exists a correlation among three key parameters concerning the plateau phase, i.e., the end…

High Energy Astrophysical Phenomena · Physics 2019-11-06 Chen-Han Tang , Yong-Feng Huang , Jin-Jun Geng , Zhi-Bin Zhang

The follow-up of $\gamma$-ray bursts (GRBs) by the X-ray telescope (XRT, 0.3-10 keV) on board the Neil Gehrels Swift Observatory led to the discovery of a shallow decay phase (the so-called plateau) of the X-ray emission in a good fraction…

High Energy Astrophysical Phenomena · Physics 2020-06-26 Gor Oganesyan

We present a comprehensive statistical analysis of Swift X-ray light-curves of Gamma-Ray Bursts (GRBs) collecting data from more than 650 GRBs discovered by Swift and other facilities. The unprecedented sample size allows us to constrain…

The statistics of X-ray flares in the afterglow of gamma-ray bursts (GRBs) have been studied extensively without considering the possible different origins of each flare. By satisfying six observational criteria, we find a sample composed…

High Energy Astrophysical Phenomena · Physics 2018-02-07 Y. Wang , Y. Aimuratov , R. Moradi , M. Peresano , R. Ruffini , S. Shakeri
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