C. Kouveliotou
A5013979618- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Particle Detector Development and Performance
- Geophysics and Gravity Measurements
- Statistical and numerical algorithms
- SAS software applications and methods
- Solar and Space Plasma Dynamics
- Advanced X-ray and CT Imaging
- Radiation Detection and Scintillator Technologies
- Planetary Science and Exploration
- CCD and CMOS Imaging Sensors
- Methane Hydrates and Related Phenomena
- Geophysics and Sensor Technology
- Geomagnetism and Paleomagnetism Studies
- Mechanics and Biomechanics Studies
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
George Washington University
2015-2024
Istituto Nazionale di Ricerca Metrologica
2023
Max Planck Institute for Radio Astronomy
2023
Gifu Women's University
2019-2022
Institute of Mathematical Statistics
2020
Marshall Space Flight Center
2006-2015
National Space Science and Technology Center
2005-2015
Office of Science
2013-2015
AlbaNova
2011-2014
Stockholm University
2014
view Abstract Citations (1679) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Identification of Two Classes Gamma-Ray Bursts Kouveliotou, Chryssa ; Meegan, Charles A. Fishman, Gerald J. Bhat, Narayana P. Briggs, Michael S. Koshut, Thomas M. Paciesas, William Pendleton, Geoffrey N. We have studied the duration distribution gamma-ray bursts first BATSE catalog. find a bimodality in distribution, which separates GRBs into two classes: short...
Detectors aboard the Compton Gamma Ray Observatory have observed an unexplained terrestrial phenomenon: brief, intense flashes of gamma rays. These must originate in atmosphere at altitudes above least 30 kilometers order to escape atmospheric absorption and reach orbiting detectors. At a dozen such events been detected over past 2 years. The photon spectra from are very hard (peaking high-energy portion spectrum) consistent with bremsstrahlung emission energetic (million—electron volt)...
The Gamma-Ray Burst Monitor (GBM) will significantly augment the science return from Fermi Observatory in study of gamma-ray bursts (GRBs). primary objective GBM is to extend energy range over which are observed downward Large Area Telescope (LAT) on into hard X-ray where extensive previous data sets exist. A secondary compute burst locations onboard allow re-orienting spacecraft so that LAT can observe delayed emission bright bursts. uses an array 12 sodium iodide scintillators and two...
We present new observations of the early X-ray afterglows first 27 gamma-ray bursts (GRBs) well observed by Swift X-Ray Telescope (XRT). The show a canonical behavior, where light curve broadly consists three distinct power-law segments: (1) an initial very steep decay (∝t-α with 3 ≲ α1 5), followed (2) shallow (0.5 α2 1.0), and finally (3) somewhat steeper (1 α3 1.5). These segments are separated two corresponding break times, tbreak,1 500 s 103 tbreak,2 104 s. On top this many events have...
The Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (CGRO) has triggered 1637 cosmic gamma-ray bursts between 1991 April 19 1996 August 29. These events constitute Fourth BATSE burst catalog. current version (4Br) been revised from first circulated CD-ROM in September 1997 (4B) to include improved locations for a subset of that have reprocssed using additional data. A significant difference previous catalogs is inclusion periods when trigger energy range...
Short gamma-ray bursts (SGRBs) are among the most luminous explosions in universe, releasing less than one second energy emitted by our Galaxy over year. Despite decades of observations, nature their "central engine" remains unknown. Considering a binary magnetized neutron stars and solving Einstein equations, we show that merger results rapidly spinning black hole surrounded hot highly torus. Lasting 35 ms much longer previous simulations, study reveals magnetohydrodynamical instabilities...
Variable X-ray and gamma-ray emission is characteristic of the most extreme physical processes in Universe, studying sources these energetic photons has been a major driver astronomy for past 50 years. Here we present multiwavelength observations unique selected transient, discovered by Swift, which was accompanied bright across electromagnetic spectrum, whose properties are unlike any previously observed source. We pinpoint event to center small, star-forming galaxy at redshift z=0.3534....
(Abridged). We present a sample of 77 optical afterglows (OAs) Swift detected GRBs for which spectroscopic follow-up observations have been secured. provide linelists and equivalent widths all lines redward Ly-alpha. discuss to what extent the current bursts with OA spectroscopy is biased subsample GRBs. For that purpose we define an X-ray selected optimal conditions ground-based follow up from period March 2005 September 2008; 146 fulfill our criteria. derive redshift distribution this...
Soft gamma repeaters and anomalous x-ray pulsars form a rapidly increasing group of sources exhibiting sporadic emission short bursts. They are believed to be magnetars, i.e. neutron stars powered by extreme magnetic fields, B~10^{14}-10^{15} Gauss. We report on soft repeater with low field, SGR 0418+5729, recently detected after it emitted bursts similar those magnetars. X-ray observations show that its dipolar field cannot greater than 7.5x10^{12} Gauss, well in the range ordinary radio...