Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B

Monsalvo, Ignacio de Gregorio; Zhang, B.-B.; Żarnecki, Aleksander Filip; Zhang, B.; Castro-Tirado, A. J.; Dai, Z. G.; Tam, P. H. T.; Wang, X.-Y.; Hu, Y.-D.; Карпов, С.; Pozanenko, A.; Zhang, F.-W.; Mazaeva, E.; Minaev, P. Yu.; Volnova, A.; Oates, S. R.; Oats, S. R.; Gao, He; Wu, Xue-Feng; Shao, L.; Tang, Qing-Wen; Beskin, G.; Biryukov, A. V.; Bondar, S.; Ivanov, E.; Katkova, E.; Орехова, Н. В.; Perkov, A.; Sasyuk,; Mankiewicz, L.; Żarnecki, A. F.; Ćwiek, A.; Opiela, R.; Zadrożny, A.; Aptekar, R.; Frederiks, D.; Svinkin, D.; Kusakin, A.; Inasaridze, R.; Burhonov, O.; Rumyantsev, V.; Klunko, E.; Москвитин, А. С.; Фатхуллин, Т. А.; Соколов, В. В.; Valeev, A. F.; Jeong, S.; Park, I. H.; Caballero‐García, M. D.; Cunniffe, R.; Tello, J. C.; Ferrero, P.; Pandey, S. B.; Jelínek, M.; Sánchez-Ramírez, R.; Castellón, A.

doi:10.1038/s41550-017-0309-8

Cited by 130 publications

(102 citation statements)

References 42 publications

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“…The total number of photon counts is significantly above the background counts in NaI detectors (Supplementary Figure 11). We used a software package developed by the first author, McSpecFit [10], to perform spectral fitting. The energy channels at and around the iodine K-edge at 33.17 keV [11] were excluded to better assess the quality of the fitting of spectral models.…”

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confidence: 99%

A peculiar low-luminosity short gamma-ray burst from a double neutron star merger progenitor

et al. 2018

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Double neutron star (DNS) merger events are promising candidates of short gamma-ray burst (sGRB) progenitors as well as high-frequency gravitational wave (GW) emitters. On August 17, 2017, such a coinciding event was detected by both the LIGO-Virgo gravitational wave detector network as GW170817 and Gamma-Ray Monitor on board NASA’s Fermi Space Telescope as GRB 170817A. Here, we show that the fluence and spectral peak energy of this sGRB fall into the lower portion of the distributions of known sGRBs. Its peak isotropic luminosity is abnormally low. The estimated event rate density above this luminosity is at least Gpc−3 yr−1, which is close to but still below the DNS merger event rate density. This event likely originates from a structured jet viewed from a large viewing angle. There are similar faint soft GRBs in the Fermi archival data, a small fraction of which might belong to this new population of nearby, low-luminosity sGRBs.

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confidence: 99%

A peculiar low-luminosity short gamma-ray burst from a double neutron star merger progenitor

et al. 2018

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“…GRB 160625B was extraordinarily bright and was simultaneously observed in gamma-rays and optical wavelengths. The optical counterpart was observed by instruments of IKI GRB-FuN (Abastumani, Tien-Shan, Mondy, Maidanak, Crimea) and by instruments of BOOTES network (Zhang et al 2018). The prompt emission consists of three isolated episodes separated by long quiescent intervals.…”

Section: Resultsmentioning

confidence: 98%

“…The spectral properties of the first two sub-bursts are distinctly different, allowing us to observe the transition from thermal to non-thermal radiation between well-separated emission episodes within a single GRB. Such a transition is a clear indication of the change of jet composition from a fireball to a Poynting-flux-dominated jet (Zhang et al 2018). (radius, statistical only) on August, 1, 2014 (UT) 18:59:53.…”

Section: Resultsmentioning

confidence: 99%

IKI GRB-FuN: observations of GRBs with small-aperture telescopes

Volnova

Pozanenko

Mazaeva

et al. 2021

An. Acad. Bras. Ciênc.

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Gamma-ray bursts (GRBs) are the most energetic and mysterious events in the Universe, which are observed in all ranges of electromagnetic spectrum. Most valuable results about physics of GRB are obtained by optical observations. GRBs are initially detected in gamma-rays with poor localization accuracy, and an optical counterpart should be found. The faster the counterpart is found, the more it can give to physics. This first phase, as a rule, corresponds to an early afterglow. The next phases of the observations are multicolor photometry, polarimetry, spectroscopy, and few days later the search for a supernova or kilonova associated with the GRB, and finally, observations of the host galaxy. To manage the problem of fast optical observations, telescopes with a small aperture are suitable. They can have a large field of view, which is necessary to cover initial localizations of GRBs. The sensitivity of the telescope+detector may be sufficient to record statistically significant light curve with fine time resolution. We describe one of the networks of telescopes with a small aperture IKI-GRB FuN, and present the results of early optical observation of GRB sources, and discuss the design requirements of the optical observations for effective GRB research in the next decade.

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“…We note that in the cases of a hot fireball jet characterised by a quasi-thermal Planck-like spectrum (e.g. GRB 090902B 4 ), a Poynting-flux-dominated outflow characterised by a Band (or cutoff power-law)-only function (e.g., GRB 080916C 33 and GRB 130427A 34 ), a hybrid jet characterised by either a twocomponent spectral scenario (composed of a non-thermal component and a thermal component simultaneously, e.g., GRB 110721A 21,35 ), or a transition from fireball to Poynting-flux-dominated outflow within a single GRB (e.g., GRB 160625B [36][37][38] ), have been observed in the past. However, GRB 190114C presented unique information not available before.…”

Section: Methodsmentioning

confidence: 99%

A Cosmological Fireball with Thirty-Percent Gamma-Ray Radiative Efficiency

Wang

Ryde

et al. 2021

Preprint

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Gamma-ray bursts (GRBs) are the most powerful explosions in the universe. The composition of the jets is, however, subject to debate\cite{Peer2015,Zhang2018}. Whereas the traditional model invokes a relativistic matter-dominated fireball with a bright photosphere emission component\cite{Meszaros2000}, the lack of the detection of such a component in some GRBs\cite{Abdo2009} has led to the conclusion that GRB jets may be Poynting-flux-dominated\cite{Zhang2009}. Furthermore, how efficiently the jet converts its energy to radiation is poorly constrained. A definitive diagnosis of the GRB jet composition and measurement of GRB radiative efficiency requires high-quality prompt emission and afterglow data, which has not been possible with the sparse observations in the past. Here we report a comprehensive temporal and spectral analysis of the TeV-emitting bright GRB 190114C. Its fluence is one of the highest of all GRBs detected so far, which allows us to perform a high-significance study on the prompt emission spectral properties and their variations down to a very short timescale of about 0.1 s. We identify a clear thermal component during the first two prompt emission episodes, which is fully consistent with the prediction of the fireball photosphere model. The third episode of the prompt emission is consistent with synchrotron radiation from the deceleration of the fireball. This allows us to directly dissect the fireball energy budget in a parameter-independent manner\cite{Zhang2021} and robustly measure a nearly $30\%$ radiative efficiency for this GRB. The afterglow microphysics parameters can be also well constrained from the data. GRB 190114C, therefore, exhibits the evolution of a textbook-version relativistic fireball, suggesting that fireballs can indeed power at least some GRBs with high efficiency.

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Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B

Cited by 130 publications

References 42 publications

A peculiar low-luminosity short gamma-ray burst from a double neutron star merger progenitor

A peculiar low-luminosity short gamma-ray burst from a double neutron star merger progenitor

IKI GRB-FuN: observations of GRBs with small-aperture telescopes

A Cosmological Fireball with Thirty-Percent Gamma-Ray Radiative Efficiency

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