B. L. Dingus
A5024913743- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysical Phenomena and Observations
- Radiation Detection and Scintillator Technologies
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Computational Physics and Python Applications
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Statistical and numerical algorithms
- Earthquake Detection and Analysis
- Particle accelerators and beam dynamics
- Radiation Therapy and Dosimetry
- Ionosphere and magnetosphere dynamics
Los Alamos National Laboratory
2015-2024
University of Maryland, College Park
1986-2023
Friedrich-Alexander-Universität Erlangen-Nürnberg
2023
Universidad de Guadalajara
2023
University of Manitoba
2021
Chungbuk National University
2021
New York University Abu Dhabi
2021
Barnard College
2021
Queen's University
2021
North Carolina State University
2021
The third catalog of high-energy gamma-ray sources detected by the EGRET telescope on Compton Gamma Ray Observatory includes data from 1991 April 22 to 1995 October 3 (cycles 1, 2, 3, and 4 mission). In addition including more than second its supplement, this uses completely reprocessed (to correct a number mostly minimal errors problems). 271 (E > 100 MeV) in include single solar flare bright enough be as source, Large Magellanic Cloud, five pulsars, one probable radio galaxy detection (Cen...
view Abstract Citations (1007) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Likelihood Analysis of EGRET Data Mattox, J. R. ; Bertsch, D. L. Chiang, Dingus, B. Digel, S. W. Esposito, A. Fierro, M. Hartman, C. Hunter, Kanbach, G. Kniffen, Lin, Y. Macomb, Mayer-Hasselwander, H. Michelson, P. F. von Montigny, Mukherjee, Nolan, Ramanamurthy, V. Schneid, E. Sreekumar, Thompson, Willis, T. use likelihood for the analysis high-energy γ-ray...
The all-sky survey in high-energy gamma rays (E$>$30 MeV) carried out by the Energetic Gamma Ray Experiment Telescope (EGRET) aboard Compton Gamma-Ray Observatory provides a unique opportunity to examine detail diffuse gamma-ray emission. observed emission has Galactic component arising from cosmic-ray interactions with local interstellar gas and radiation as well an almost uniformly distributed that is generally believed originate outside Galaxy. Through careful study removal of emission,...
The high-energy diffuse gamma-ray emission from the Galactic plane, |b| ≤ 10°, is studied using observations Energetic Gamma-Ray Experiment Telescope (EGRET) on Compton Observatory. spatial distribution of has been determined for four broad energy ranges after removing contribution point sources detected with greater than 5 σ significance. longitude and latitude distributions intensity, averaged over 4° 10° ranges, respectively, are shown ranges. Spectra in 11 bands, covering range 30 MeV to...
Gamma-ray bursts (GRBs) are highly energetic explosions signaling the death of massive stars in distant galaxies. The Burst Monitor and Large Area Telescope onboard Fermi Observatory together record GRBs over a broad energy range spanning about 7 decades gammaray energy. In September 2008, observed exceptionally luminous GRB 080916C, with largest apparent release yet measured. high-energy gamma rays to start later persist longer than lower photons. A simple spectral form fits entire...
Exotic origin for cosmic positrons Several cosmic-ray detectors have found more arriving at Earth than expected. Some researchers interpret this as a signature of exotic physics, such the annihilation dark matter particles. Others prefer mundane explanation that involves positron generation pulsars followed by diffusion to Earth. Abeysekara et al. detected extended emission gamma rays around two nearby pulsars, generated high-energy electrons and positrons. The size was used calculate how...
We report on the observation of bright, long gamma-ray burst, GRB 090902B, by Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments on-board Fermi observatory. This was one brightest GRBs to have been observed LAT, which detected several hundred photons during prompt phase. With a redshift z = 1.822, this burst is among most luminous Fermi. Time-resolved spectral analysis reveals significant power-law component in LAT data that distinct from usual Band model emission seen...
We present detailed observations of the bright short-hard gamma-ray burst GRB 090510 made with Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) on board Fermi observatory. is first detected by LAT that shows strong evidence for a deviation from Band spectral fitting function during prompt emission phase. The time-integrated spectrum fit sum $\Epeak = 3.9\pm 0.3$\,MeV, which highest yet measured, hard power-law component photon index $-1.62\pm 0.03$ dominates below...
The Crab Nebula is the brightest TeV gamma-ray source in sky and has been used for past 25 years as a reference astronomy, calibration verification of new instruments. High Altitude Water Cherenkov Observatory (HAWC), completed early 2015, to observe at high significance across nearly full spectrum energies which HAWC sensitive. unique its wide field-of-view, 2 sr any instant, high-energy reach, up 100 TeV. HAWC's sensitivity improves with energy. Above $\sim$1 driven by best background...
We present the first catalog of TeV gamma-ray sources realized with recently completed High Altitude Water Cherenkov Observatory (HAWC). It is most sensitive wide field-of-view telescope currently in operation, a 1-year survey sensitivity ~5-10% flux Crab Nebula. With an instantaneous field view >1.5 sr and >90% duty cycle, it continuously surveys monitors sky for gamma ray energies between hundreds GeV tens TeV. HAWC located Mexico at latitude 19 degree North was March 2015. Here, we 2HWC...
In three years of observations since the beginning nominal science operations in August 2008, Large Area Telescope (LAT) on board Fermi Gamma Ray Space has observed high-energy (>20 MeV) \gamma-ray emission from 35 gamma-ray bursts (GRBs). Among these, 28 GRBs have been detected above 100 MeV and 7 ~ 20 MeV. The first Fermi-LAT catalog is a compilation these detections provides systematic study for time. To generate catalog, we examined 733 by Gamma-Ray Burst Monitor (GBM) processed each...
Abstract We present TeV gamma-ray observations of the Crab Nebula, standard reference source in ground-based astronomy, using data from High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory. In this analysis we use two independent energy estimation methods that utilize extensive air shower variables such as core position, angle, and lateral distribution. contrast, previously published HAWC spectrum roughly estimated with only number photomultipliers triggered. This new methodology...
view Abstract Citations (463) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Second EGRET Catalog of High-Energy Gamma-Ray Sources Thompson, D. J. ; Bertsch, L. Dingus, B. Esposito, A. Etienne, Fichtel, C. E. Friedlander, P. Hartman, R. Hunter, S. Kendig, Mattox, McDonald, M. von Montigny, Mukherjee, Ramanamurthy, V. Sreekumar, Fierro, Lin, Y. Michelson, F. Nolan, Shriver, K. Willis, T. Kanbach, G. Mayer-Hasselwander, H. Merck, Radecke,...
view Abstract Citations (456) References (122) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-Energy Gamma-Ray Emission from Active Galaxies: EGRET Observations and Their Implications von Montigny, C. ; Bertsch, D. L. Chiang, J. Dingus, B. Esposito, A. Fichtel, E. Fierro, M. Hartman, R. Hunter, S. Kanbach, G. Kniffen, Lin, Y. Mattox, Mayer-Hasselwander, H. Michelson, P. F. Nolan, Radecke, Schneid, Sreekumar, Thompson, Willis, T. The energetic Experiment...
A survey of Galactic gamma-ray sources at a median energy ~20 TeV has been performed using the Milagro Gamma-Ray Observatory. Eight candidate emission are detected with pretrial significances >4.5 σ in region longitude l ∊ [30°, 220°] and latitude b [-10°, 10°]. Four these sources, including Crab Nebula recently published MGRO J2019+37, observed >4 after accounting for trials. All four also coincident EGRET sources. Two lower significance one is Geminga. The other two candidates Cygnus...
view Abstract Citations (339) References (41) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The First Energetic Gamma-Ray Experiment Telescope (EGRET) Source Catalog Fichtel, C. E. ; Bertsch, D. L. Chiang, J. Dingus, B. Esposito, A. Fierro, M. Hartman, R. Hunter, S. Kanbach, G. Kniffen, Kwok, P. W. Lin, Y. Mattox, Mayer-Hasselwander, H. McDonald, Michelson, F. von Montigny, Nolan, Pinkau, K. Radecke, -D. Rothermel, Sreekumar, Sommer, Schneid, Thompson,...
The Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Observatory (CGRO) has so far detected 51 blazars during phases 1, 2, and 3, cycle 4 of CGRO mission. We present here a summary these observations, including flux variations spectra blazars. high luminosities time seen in gamma-ray data indicate that gamma rays are an important component relativistic jet thought to characterize
The diffuse gamma radiation arising from the interaction of cosmic-ray particles with matter and in Galaxy is one few probes available to study origin cosmic rays. Data Milagro gamma-ray observatory—a water Cerenkov detector that continuously views ~2 sr overhead sky—shows brightest extended region entire northern sky Cygnus Galactic plane. TeV image contains at least new source, MGRO J2019+37, which 10.9 σ above isotropic background, as well correlations density region. However, flux (after...
We report on the observation of bright, long gamma-ray burst, GRB 090926A, by Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments board \Fermi\ Space Telescope. 090926A shares several features with other bright LAT bursts. In particular, it clearly shows a short spike in light curve that is present all detectors see this turn suggests there common region emission across entire energy range. addition, while separate high-energy power-law component has already been...
The 7 year data set of the Milagro TeV observatory contains 2.2 x 10(11) events which most are due to hadronic cosmic rays. These searched for evidence intermediate scale structure. Excess emission on angular scales approximately 10 degrees has been found in two localized regions unknown origin with greater than 12sigma significance. Both inconsistent pure gamma-ray high confidence. One a different energy spectrum isotropic cosmic-ray flux at level 4.6sigma, and it is consistent hard protons...