Related papers: GRB990123: Evidence that the Gamma Rays Come from …

Gamma-ray burst early afterglows: reverse shock emission from an arbitrarily magnetized ejecta

Evidence suggests that the gamma-ray burst (GRB) ejecta is likely magnetized, although the degree of magnetization of the ejecta is unknown. We derive a rigorous analytical solution for the relativistic 90 degree shocks under the ideal MHD…

Astrophysics · Physics 2009-11-10 Bing Zhang , Shiho Kobayashi

Long gamma-ray burst light curves as the result of a common stochastic pulse-avalanche process

Context. The complexity and variety exhibited by the light curves of long gamma-ray bursts (GRBs) enclose a wealth of information that still awaits being fully deciphered. Despite the tremendous advance in the knowledge of the energetics,…

High Energy Astrophysical Phenomena · Physics 2024-09-25 Lorenzo Bazzanini , Lisa Ferro , Cristiano Guidorzi , Giuseppe Angora , Lorenzo Amati , Massimo Brescia , Mattia Bulla , Filippo Frontera , Romain Maccary , Manuele Maistrello , Piero Rosati , Anastasia Tsvetkova

Gamma-Ray Bursts from quark stars

Long gamma-ray bursts (GRBs) are believed to be related to the explosion of type Ic supernovae, which have been stripped of their hydrogen and helium envelopes. There appear to be two types of these explosions: those which are approximately…

Astrophysics · Physics 2009-11-10 B. Paczynski , P. Haensel

The Unique Signature of Shell Curvature in Gamma-Ray Bursts

As a result of spherical kinematics, temporal evolution of received gamma-ray emission should demonstrate signatures of curvature from the emitting shell. Specifically, the shape of the pulse decay must bear a strict dependence on the…

Astrophysics · Physics 2009-11-06 Alicia M. Soderberg , Edward E. Fenimore

Prompt Gamma-ray and Early Afterglow Emission in the External Shock Model

We describe our attempt to determine if gamma-ray burst (GRB) and afterglow emissions could both arise in external shocks for simple GRBs--bursts consisting of just a few peaks in their lightcurves. We calculate peak flux and peak frequency…

Astrophysics · Physics 2016-08-30 E. McMahon , P. Kumar , A. Panaitescu

GRB 091024A and the nature of ultra-long gamma-ray bursts

We present a broadband study of gamma-ray burst (GRB) 091024A within the context of other ultra-long-duration GRBs. An unusually long burst detected by Konus-Wind, Swift, and Fermi, GRB 091024A has prompt emission episodes covering ~1300 s,…

High Energy Astrophysical Phenomena · Physics 2015-06-17 F. J. Virgili , C. G. Mundell , V. Pal'shin , C. Guidorzi , R. Margutti , A. Melandri , R. Harrison , S. Kobayashi , R. Chornock , A. Henden , A. C. Updike , S. B. Cenko , N. R. Tanvir , I. A. Steele , A. Cucchiara , A. Gomboc , A. Levan , Z. Cano , C. J. Mottram , N. R. Clay , D. Bersier , D. Kopac , J. Japelj , A. V. Filippenko , W. Li , D. Svinkin , S. Golenetskii , D. H. Hartmann , P. A. Milne , G. Williams , P. T. O'Brien , D. B. Fox , E. Berger

Timing diagrams and correlations in gamma-ray bursts signal jets from accretion into black holes

The temporal properties of a sample of 498 bright gamma-ray bursts (GRBs) with durations between 0.05 s and 674 s were analysed. The large range in duration (T90) is accompanied by a similarly large range in the median values of the pulse…

Astrophysics · Physics 2009-11-07 S. McBreen , B. McBreen , F. Quilligan , L. Hanlon

Multi-epoch afterglow rebrightenings in GRB 250129A: Evidence for successive shock interactions

Most long gamma-ray bursts (GRBs) exhibit afterglows broadly consistent with external forward-shock emission, typically described by smooth broken power-law decays in the multiband light curve. However, a minority of well-sampled GRBs…

High Energy Astrophysical Phenomena · Physics 2026-03-10 D. Akl , S. Antier , H. Koehn , P. T. H. Pang , J. J. Geng , R. Gill , E. Abdikamalov , C. Adami , V. Aivazyan , L. Almeida , S. Alshamsi , C. Andrade , Q. André , C. Angulo-Valdez , J. -L. Atteia , K. Barkaoui , S. Basa , R. L. Becerra , P. Bendjoya , D. Berdikhan , E. Bernaud , S. Boissier , S. Brunier , A. Y. Burdanov , N. R. Butler , J. Chen , F. Colas , W. Corradi , M. W. Coughlin , D. Darson , T. Dietrich , D. Dornic , C. Douzet , C. Dubois , J. -G. Ducoin , T. du Laz , A. Durroux , D. Dutton , P. -A. Duverne , F. Dux , E. G. Elhosseiny , A. Esamdin , A. V. Filippenko , F. Fortin , M. Freeberg , L. García-García , M. Gillon , N. Globus , P. Gokuldass , N. Guessoum , P. Hello , R. Hellot , Y. H. M. Hendy , Y. L. Hua , T. Hussenot-Desenonges , R. Inasaridze , A. Iskandar , M. Jelínek , S. Karpov , A. Klotz , N. Kochiashvili , T. Laskar , A. Le Calloch , W. H. Lee , S. Leonini , X. Y. Li , A. Lien , C. Limonta , J. Liu , D. López-Cámara , F. Magnani , J. Mao , M. Mašek , E. Moreno Méndez , L. C. Menegazzi , W. Mercier , B. M. Mihov , M. Molham , S. Oates , M. Odeh , H. Peng , M. Pereyra , M. Pillas , T. Pradier , N. A. Rakotondrainibe , D. Reichart , J. -P. Rivet , F. D. Romanov , F. Sánchez-Álvarez , N. Sasaki , D. Schlekat , B. Schneider , A. Simon , L. Slavcheva-Mihova , R. Strausbaugh , T. R. Sun , A. Takey , M. Tanasan , D. Turpin , A. de Ugarte Postigo , L. T. Wang , X. F. Wang , Z. M. Wang , A. M. Watson , J. de Wit , Y. S. Yan , W. Zheng , S. Zúñiga-Fernández

Explaining the High Energy Spectral Component in GRB 941017

The gamma-ray burst (GRB) of October 17, 1994 (941017), showed a distinct high energy spectral component extending from $\lesssim$ a few MeV to $\gtrsim$ 200 MeV, in addition to the typical GRB emission which peaked at $\lesssim$ a few…

Astrophysics · Physics 2009-11-10 Jonathan Granot , Dafne Guetta

Light curves and spectra from off-axis gamma-ray bursts

If gamma-ray burst prompt emission originates at a typical radius, and if material producing the emission moves at relativistic speed, then the variability of the resulting light curve depends on the viewing angle. This is due to the fact…

High Energy Astrophysical Phenomena · Physics 2016-06-28 Om S. Salafia , Gabriele Ghisellini , Alessio Pescalli , Giancarlo Ghirlanda , Francesco Nappo

Naked-eye optical flash from GRB 080319B: Tracing the decaying neutrons in the outflow

For an unsteady baryonic gamma-ray burst (GRB) outflow, the fast and slow proton shells collide with each other and produce energetic soft gamma-ray emission. If the outflow has a significant neutron component, the ultra-relativistic…

High Energy Astrophysical Phenomena · Physics 2009-01-21 Yi-Zhong Fan , Bing Zhang , Da-Ming Wei

Soft X-ray prompt emission from a high-redshift gamma-ray burst EP240315a

Long gamma-ray bursts (GRBs) are believed to originate from core collapse of massive stars. High-redshift GRBs can probe the star formation and reionization history of the early universe, but their detection remains rare. Here we report the…

High Energy Astrophysical Phenomena · Physics 2024-04-26 Y. Liu , H. Sun , D. Xu , D. S. Svinkin , J. Delaunay , N. R. Tanvir , H. Gao , C. Zhang , Y. Chen , X. -F. Wu , B. Zhang , W. Yuan , J. An , G. Bruni , D. D. Frederiks , G. Ghirlanda , J. -W. Hu , A. Li , C. -K. Li , J. -D. Li , D. B. Malesani , L. Piro , G. Raman , R. Ricci , E. Troja , S. D. Vergani , Q. -Y. Wu , J. Yang , B. -B. Zhang , Z. -P. Zhu , A. de Ugarte Postigo , A. G. Demin , D. Dobie , Z. Fan , S. -Y. Fu , J. P. U. Fynbo , J. -J. Geng , G. Gianfagna , Y. -D. Hu , Y. -F. Huang , S. -Q. Jiang , P. G. Jonker , Y. Julakanti , J. A. Kennea , A. A. Kokomov , E. Kuulkers , W. -H. Lei , J. K. Leung , A. J. Levan , D. -Y. Li , Y. Li , S. P. Littlefair , X. Liu , A. L. Lysenko , Y. -N. Ma , A. Martin-Carrillo , P. O'Brien , T. Parsotan , J. Quirola-Vasquez , A. V. Ridnaia , S. Ronchini , A. Rossi , D. Mata-Sanchez , B. Schneider , R. -F. Shen , A. L. Thakur , A. Tohuvavohu , M. A. P. Torres , A. E. Tsvetkova , M. V. Ulanov , J. -J. Wei , D. Xiao , Y. -H. I. Yin , M. Bai , V. Burwitz , Z. -M. Cai , F. -S. Chen , H. -L. Chen , T. -X. Chen , W. Chen , Y. -F. Chen , Y. -H. Chen , H. -Q. Cheng , C. -Z. Cui , W. -W. Cui , Y. -F. Dai , Z. -G. Dai , J. Eder , D. -W. Fan , C. Feldman , H. Feng , Z. Feng , P. Friedrich , X. Gao , J. Guan , D. -W Han , J. Han , D. -J. Hou , H. -B. Hu , T. Hu , M. -H. Huang , J. Huo , I. Hutchinson , Z. Ji , S. -M. Jia , Z. -Q. Jia , B. -W. Jiang , C. -C. Jin , G. Jin , J. -J. Jin , A. Keereman , H. Lerman , J. -F. Li , L. -H. Li , M. -S. Li , W. Li , Z. -D. Li , T. -Y. Lian , E. -W. Liang , Z. -X. Ling , C. -Z. Liu , H. -Y. Liu , H. -Q. Liu , M. -J. Liu , Y. -R. Liu , F. -J. Lu , H. -J. LU , L. -D. Luo , F. L. Ma , J. Ma , J. -R. Mao , X. Mao , M. McHugh , N. Meidinger , K. Nandra , J. P. Osborne , H. -W. Pan , X. Pan , M. E. Ravasio , A. Rau , N. Rea , U. Rehman , J. Sanders , A. Santovincenzo , L. -M. Song , J. Su , L. -J. Sun , S. -L. Sun , X. -J. Sun , Y. -Y. Tan , Q. -J. Tang , Y. -H. Tao , J. -Z. Tong , H. Wang , J. Wang , L. Wang , W. -X. Wang , X. -F. Wang , X. -Y. Wang , Y. -L. Wang , Y. -S. Wang , D. -M. Wei , R. Willingale , S. -L. Xiong , H. -T. Xu , J. -J. Xu , X. -P. Xu , Y. -F. Xu , Z. Xu , C. -B. Xue , Y. -L. Xue , A. -L. Yan , F. Yang , H. -N. Yang , X. -T. Yang , Y. -J Yang , Y. -W. Yu , J. Zhang , M. Zhang , S. -N. Zhang , W. -D. Zhang , W. -J. Zhang , Y. -H. Zhang , Z. Zhang , Z. Zhang , Z. -L. Zhang , D. -H. Zhao , H. -S. Zhao , X. -F. Zhao , Z. -J. Zhao , L. -X. Zhou , Y. -L. Zhou , Y. -X. Zhu , Z. -C. Zhu , X. -X. Zuo

GRB 990123 revisited: Further Evidence for a Reverse Shock

Recently we have presented a new theoretical analysis of the reverse shock emission. We use this analysis here to revisit GRB 990123. We find new and compelling evidences that the optical flash and the radio flare of GRB 990123 resulted…

Astrophysics · Physics 2009-11-10 Ehud Nakar , Tsvi Piran

Unification of Pulses in Long and Short Gamma-Ray Bursts: Evidence from Pulse Properties and their Correlations

We demonstrate that distinguishable gamma-ray burst pulses exhibit similar behaviors as evidenced by correlations among the observable pulse properties of duration, peak luminosity, fluence, spectral hardness, energy-dependent lag, and…

High Energy Astrophysical Phenomena · Physics 2015-05-27 Jon Hakkila , Robert D. Preece

GRB 060206: hints of precession of the central engine?

Aims. The high-redshift (z = 4:048) gamma-ray burst GRB 060206 showed unusual behavior, with a significant rebrightening by a factor of ~ 4 at about 3000 s after the burst. We argue that this rebrightening implies that the central engine…

Astrophysics · Physics 2015-05-13 X. W. Liu , X. F. Wu , T. Lu

Gamma-ray burst early optical afterglows: implications for the initial Lorentz factor and the central engine

Early optical afterglows have been observed from GRB 990123, GRB 021004, and GRB 021211, which reveal rich emission features attributed to reverse shocks. It is expected that Swift will discover many more early afterglows. Here we…

Astrophysics · Physics 2011-06-21 Bing Zhang , Shiho Kobayashi , Peter Meszaros

A Peculiarly Short-duration Gamma-Ray Burst from Massive Star Core Collapse

Gamma-ray bursts (GRBs) have been phenomenologically classified into long and short populations based on the observed bimodal distribution of duration. Multi-wavelength and multi-messenger observations in recent years have revealed that in…

High Energy Astrophysical Phenomena · Physics 2021-07-27 B. -B. Zhang , Z. -K. Liu , Z. -K. Peng , Y. Li , H. -J. Lü , J. Yang , Y. -S. Yang , Y. -H. Yang , Y. -Z. Meng , J. -H. Zou , H. -Y. Ye , X. -G. Wang , J. -R. Mao , X. -H. Zhao , J. -M. Bai , A. J. Castro-Tirado , Y. -D. Hu , Z. -G. Dai , E. -W. Liang , B. Zhang

Evidence for an Early High-Energy Afterglow Observed with BATSE from GRB980923

In this Letter, we present the first evidence in the BATSE data for a prompt high-energy (25-300 keV) afterglow component from a gamma-ray burst (GRB), GRB980923. The event consists of rapid variabilty lasting ~40 s followed by a smooth…

Astrophysics · Physics 2009-10-31 T. W. Giblin , J. van Paradijs , C. Kouveliotou , V. Connaughton , R. A. M. J. Wijers , M. S. Briggs , R. D. Preece , G. J. Fishman

Spectro-polarimetry of GRB 180427A: evidence for distinct emission sites with varying polarisation

The dynamics of the origin of gamma-ray emissions in gamma-ray bursts (GRBs) remains an enigma. Through a joint analysis of GRB 180427A, observed by the Fermi Gamma-ray Space Telescope and AstroSat's Cadmium Zinc Telluride Imager, we…

High Energy Astrophysical Phenomena · Physics 2026-01-15 Rushikesh Sonawane , Shabnam Iyyani , Soumya Gupta , Tanmoy Chattopadhyay , Dipankar Bhattacharya , Varun. B. Bhalerao , Santosh V. Vadawale , G. C. Dewangan

Observations of GRB 990123 by the Compton Gamma-Ray Observatory

GRB 990123 was the first burst from which simultaneous optical, X-ray and gamma-ray emission was detected; its afterglow has been followed by an extensive set of radio, optical and X-ray observations. We have studied the gamma-ray burst…

Astrophysics · Physics 2009-10-31 M. S. Briggs , D. L. Band , R. M. Kippen , R. D. Preece , C. Kouveliotou , J. van Paradijs , G. H. Share , R. J. Murphy , S. M. Matz , A. Connors , C. Winkler , M. L. McConnell , J. M. Ryan , O. R. Williams , C. A. Young , B. Dingus , J. R. Catelli , R. A. M. J. Wijers