J. R. Cummings
A5109937829- Gamma-ray bursts and supernovae
- SAS software applications and methods
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Microbial Metabolites in Food Biotechnology
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Housing Market and Economics
- Stellar, planetary, and galactic studies
- Nuclear Physics and Applications
- Financial Markets and Investment Strategies
- Nuclear physics research studies
- Banking stability, regulation, efficiency
- Corporate Finance and Governance
- Atmospheric Ozone and Climate
- Advanced Topology and Set Theory
- Particle Detector Development and Performance
- X-ray Spectroscopy and Fluorescence Analysis
- Financial Literacy, Pension, Retirement Analysis
- Market Dynamics and Volatility
- Computability, Logic, AI Algorithms
University of York
2022-2024
Carnegie Mellon University
2024
Merck Serono (Italy)
2023
Research & Development Institute
2023
University of Manchester
2022
The University of Sydney
2008-2019
Macquarie University
2015-2016
Goddard Space Flight Center
2005-2014
University of Maryland, Baltimore County
2007-2014
Oxford Computer Services (United States)
2012
Gamma-ray burst (GRB) afterglows have provided important clues to the nature of these massive explosive events, providing direct information on nearby environment and indirect central engine that powers burst. We report discovery two bright x-ray flares in GRB afterglows, including a giant flare comparable total energy itself, each peaking minutes after These strong, rapid imply engines bursts long periods activity, with strong internal shocks continuing for hundreds seconds gamma-ray...
The Swift/Burst Alert Telescope (BAT) hard X-ray transient monitor provides near real-time coverage of the sky in energy range 15-50 keV. BAT observes 88% each day with a detection sensitivity 5.3 mCrab for full-day observation and time resolution as fine 64 seconds. three main purposes are (1) discovery new sources, (2) outbursts or other changes flux known (3) generation light curves more than 900 sources spanning over eight years. primary interface is public web page. Between 2005...
Probiotic products in the United States are available for use general category of dietary supplements, bypassing rigor US Food and Drug Administration (FDA) approval process safety, efficacy, manufacturing standards. As a result, currently probiotics lack FDA-approved drug labeling cannot be marketed to treat or prevent disease preterm infants, including necrotizing enterocolitis late-onset sepsis. Despite availability pharmaceutical-grade product, number infants receiving Canada is steadily...
We present observations of GRB 060124, the first event for which both prompt and afterglow emission could be observed simultaneously in their entirety by three Swift instruments. Indeed, Swift-BAT triggered on a precursor ~570s before main burst peak, this allowed to repoint narrow field instruments position ~350s occurred. 060124 also Konus-Wind, harder gamma-ray band (up 2MeV). Thanks these exceptional circumstances, temporal spectral properties can studied optical, X-ray ranges. While...
This paper discusses Swift observations of the gamma-ray burst GRB 050315 (z=1.949) from 80 s to 10 days after onset burst. The X-ray light curve displayed a steep early decay (t^-5) for ~200 and several breaks. However, both prompt hard X-ray/gamma-ray emission (observed by BAT) first ~ 300 XRT) can be explained exponential decays, with similar constants. Extrapolating BAT into XRT band suggests rapidly decaying, was simply continuation fading emission; this strong similarity between may...
Ocean data assimilation has reached a sufficient level of maturity such that observations are routinely combined with model forecasts to produce variety ocean products. Approaches vary widely both in terms the sophistication method and assimilated, also specification forecast error covariances, biases, observation errors, quality-control procedures. In this paper, we describe some systems have been developed within Global Data Assimilation Experiment (GODAE) community. We discuss methods,...
We present a generalized analytic formalism for the inverse Compton X-ray emission from hydrogen-poor supernovae and apply this framework to SN 2011fe using Swift X-Ray Telescope (XRT), UVOT, Chandra observations. characterize optical properties of in bands find them be broadly consistent with "normal" Ia, however, no source is detected by either XRT or Chandra. constrain progenitor system mass-loss rate (3σ c.l.) wind velocity vw = 100 km s−1. Our result rules out symbiotic binary...
We report abundances of elements from 26Fe to 34Se in the cosmic radiation measured during fifty days exposure Trans-Iron Galactic Element Recorder (TIGER) balloon-borne instrument. These observations add support concept that bulk ray acceleration takes place OB associations, and they further models which present interstellar grains are accelerated preferentially compared with those found gas.
Relativistic iron, lanthanum, holmium, and gold projectile nuclei with several different energies have been fragmented in targets of polyethylene, carbon, aluminum, copper, lead. Our detectors cleanly resolve the individual charges heaviest these fragments provide some limited information on masses. We measured 1256 elemental partial cross sections for production from interactions target materials. Values derived another 417 a hydrogen medium. These depend energy mass as well nature target....
Short duration (2 s) Gamma-ray bursts (GRBs) have been a mystery since their discovery. Until May 2005 very little was known about short GRBs, but this situation has changed rapidly in the last few months Swift and HETE-2 satellites made it possible to discover X-ray optical counterparts these sources. Positional associations indicate that GRBs arise close-by galaxies (). Here we report on detailed study of GRB 050724 afterglow. This burst shows strong flaring variability band. It clearly...
We report on the discovery by Swift Gamma-Ray Burst Explorer of eighth known transient accretion-powered millisecond pulsar, SWIFT J1756.9-2508, as part routine observations with Alert Telescope hard X-ray monitor. The pulsar was subsequently observed both X-Ray and Rossi Timing Proportional Counter Array. It has a spin frequency 182 Hz (5.5 ms) an orbital period 54.7 minutes. minimum companion mass is between 0.0067 0.0086 M☉, depending neutron star, upper limit 0.030 M☉ (95% confidence...
We report Swift Burst Alert Telescope (BAT) observations of the X-ray flash (XRF) XRF 050416A. The fluence ratio between 15-25 and 25-50 keV energy bands this event is 1.1, thus making it softest gamma-ray burst (GRB) observed by BAT so far. spectrum well fitted a Band function with E 15.0 keV. Assuming redshift host galaxy (z = 0.6535), isotropic equivalent radiated Eiso peak at GRB rest frame (E) 050416A are not only consistent correlation found Amati et al. extended to XRFs Sakamoto but...
The Swift satellite has enabled us to follow the evolution of gamma-ray burst (GRB) fireballs from prompt emission afterglow phase. early x-ray and optical data obtained by telescopes aboard show that source for emission, heralds these bursts, is short lived its distinct ensuing, long-lived afterglow. Using data, we determine distance center explosion. We find this be 1e15-1e16 cm most bursts within a factor ten radius shock-heated circumstellar medium (CSM) producing photons. Furthermore,...
We report here the development of a three-dimensional (3D) magnetic force microscope for applying forces to and measuring responses biological systems materials. This instrument combines conventional optical with free-floating or specifically bound bead used as mechanical probe. Forces can be applied by microscopic structures interest (specimens), while reaction displacement is measured. enables 3D manipulations measurements performed on specimens in fluids. Force generated magnetically...
GRB 070610 is a typical high-energy event with duration of 5s.Yet within the burst localization we detect highly unusual X-ray and optical transient, SwiftJ195509.6+261406. We see high amplitude variability on very short time scales even at late times. Using near-infrared imaging assisted by laser guide star adaptive optics, identified counterpart Late-time constrain spectral type to be fainter than K-dwarf assuming it Galactic origin. It possible that Swift J195509.6+261406 are unrelated...
We present Interplanetary Network (IPN) data for the gamma-ray bursts in first Fermi Gamma-Ray Burst Monitor (GBM) catalog. Of 491 that catalog, covering 2008 July 12 to 2010 11, 427 were observed by at least one other instrument 9-spacecraft IPN. 427, localizations of 149 could be improved arrival time analysis (or triangulation). For any given burst GBM and distant spacecraft, triangulation gives an annulus possible directions whose half-width varies between about 0.4' 32 degrees,...