J. Michael Burgess
A5021532256- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- SAS software applications and methods
- Nuclear Physics and Applications
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Particle Accelerators and Free-Electron Lasers
- Particle physics theoretical and experimental studies
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Radiation Detection and Scintillator Technologies
- Geological Studies and Exploration
- Neutrino Physics Research
- Gaussian Processes and Bayesian Inference
- Paleopathology and ancient diseases
- Distributed and Parallel Computing Systems
- Hydrocarbon exploration and reservoir analysis
- Statistical and numerical algorithms
- Plant biochemistry and biosynthesis
- Solar and Space Plasma Dynamics
Max Planck Institute for Extraterrestrial Physics
2011-2025
Technical University of Munich
2017-2025
University of Geneva
2023
National Centre for Nuclear Research
2023
Chinese Academy of Sciences
2023
Max Planck Society
2017-2020
Excellence Cluster Universe
2017-2020
AlbaNova
2014-2017
Fraunhofer Chalmers Research Centre for Industrial Mathematics
2014-2017
KTH Royal Institute of Technology
2014-2017
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...
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...
The observations of the exceptionally bright gamma-ray burst (GRB) 130427A by Large Area Telescope aboard Fermi Gamma-ray Space provide constraints on nature these unique astrophysical sources. GRB had largest fluence, highest-energy photon (95 GeV), longest γ-ray duration (20 hours), and one isotropic energy releases ever observed from a GRB. Temporal spectral analyses challenge widely accepted model that nonthermal high-energy emission in afterglow phase GRBs is synchrotron radiated...
Observations of GRB 100724B with the Fermi Gamma-Ray Burst Monitor find that spectrum is dominated by typical Band functional form, which usually taken to represent a non-thermal emission component, but also includes statistically highly significant thermal spectral contribution. The simultaneous observation and components allows us confidently identify two components. fact these seem vary independently favors idea component photospheric origin while dominant occurs at larger radii. Our...
Since its launch in 2008, the Fermi Gamma-ray Burst Monitor (GBM) has triggered and located on average approximately two gamma-ray bursts (GRB) every three days. Here we present third of a series catalogs GRBs detected by GBM, extending second catalog more years, through middle July 2014. The resulting list includes 1405 triggers identified as GRBs. intention GBM GRB is to provide information community most important observables For each location main characteristics prompt emission,...
This is the second of a series catalogs gamma-ray bursts (GRBs) observed with Fermi Gamma-ray Burst Monitor (GBM). It extends first two-year catalog by two more years, resulting in an overall list 953 GBM triggered GRBs. The intention GRB to provide information community on most important observables detected For each location and main characteristics prompt emission, duration, peak flux fluence are derived. latter quantities calculated for 50 - 300 keV energy band, where maximum release...
We present the results of our year-long afterglow monitoring GW170817, first binary neutron star (NS) merger detected by advanced LIGO and Virgo. New observations with Australian Telescope Compact Array (ATCA) Chandra X-ray were used to constrain its late-time behavior. The broadband emission, from radio X-rays, is well-described a simple power-law spectrum index ~0.585 at all epochs. After an initial shallow rise ~t^0.9, displayed smooth turn-over, reaching peak luminosity ~5e39 erg/s 160...
We present systematic spectral analyses of GRBs detected by the Fermi Gamma-Ray Burst Monitor (GBM) during its first two years operation. This catalog contains types spectra extracted from 487 GRBs, and fitting four different models, this results in a compendium over 3800 spectra. The models were selected based on their empirical importance to shape many analysis performed was devised be as thorough objective possible. describe detail our procedure criteria for analyses, bulk form parameter...
GRB110721A was observed by the Fermi Gamma-ray Space Telescope using its two instruments Large Area (LAT) and Burst Monitor (GBM). The burst consisted of one major emission episode which lasted for ~24.5 seconds (in GBM) had a peak flux 5.7\pm0.2 x 10^{-5} erg/s/cm^2. time-resolved spectrum is best modeled with combination Band function blackbody spectrum. energy component initially 15\pm2 MeV, highest value ever detected in GRB. This measurement made possible combining GBM/BGO data LAT Low...
The short GRB 120323A had the highest flux ever detected with Gamma-Ray Burst Monitor on board Fermi Space Telescope. Here we study its remarkable spectral properties and their evolution using two models: (1) a single emission component scenario, where spectrum is modeled by empirical Band function (a broken power law), (2) two-component thermal Planck-like function) observed simultaneously non-thermal function). We find that latter model fits integrated burst significantly better than...
The Fermi Gamma-ray Burst Monitor (GBM) is designed to enhance the scientific return from in studying gamma-ray bursts (GRBs). In its first two years of operation GBM triggered on 491 GRBs. We summarize criteria used for triggering and quantify general characteristics GRBs, including their locations, durations, peak flux, fluence. This catalog an official product science team, data files containing complete results are available High-Energy Astrophysics Science Archive Research Center.
Astrophysical sources are now observed by many different instruments at wavelengths, from radio to high-energy gamma-rays, with an unprecedented quality. Putting all these data together form a coherent view, however, is very difficult task. Each instrument has its own format, software and analysis procedure, which combine. It for example challenging perform broadband fit of the energy spectrum source. The Multi-Mission Maximum Likelihood framework (3ML) aims solve this issue, providing...
The Fermi Gamma-ray Burst Monitor (GBM) has detected over 1400 Gamma-Ray Bursts (GRBs) since it began science operations in July, 2008. We use a subset of 300 GRBs localized by instruments such as Swift, the Large Area Telescope, INTEGRAL, and MAXI, or through triangulations from InterPlanetary Network (IPN), to analyze accuracy GBM GRB localizations. find that reported statistical uncertainties on localizations, which can be small 1 degree, underestimate distance positions true locations we...
Time-resolved spectroscopy is performed on eight bright, long gamma-ray bursts (GRBs) dominated by single emission pulses that were observed with the {\it Fermi Gamma-ray Space Telescope}. Fitting prompt radiation of GRBs empirical spectral forms such as Band function leads to ambiguous conclusions about physical model for radiation. Moreover, often inadequate fit data. The GRB spectrum therefore modeled two components consisting optically thin nonthermal synchrotron from relativistic...
Abstract GRB 200415A, a short and very bright pulse of γ-rays, has been claimed to be an extragalactic magnetar giant flare (MGF) in the galaxy NGC 253. However, as redshift transient was not measured, it is possible that measured location on celestial sphere local merely coincided. Thus, its real progenitor could have arbitrarily far away, leading much larger luminosity transient, leaving standard model gamma-ray bursts (sGRBs), merger two compact objects, explanation for observations....
We present systematic spectral analyses of gamma-ray bursts (GRBs) detected with the Burst and Transient Source Experiment (BATSE) on board Compton Gamma-Ray Observatory during its entire nine years operation. This catalog contains two types spectra extracted from 2145 GRBs, fitted five different models resulting in a compendium over 19,000 spectra. The were selected based their empirical importance to shape many analysis performed was devised be as thorough objective possible. describe...
In view of the recent report by Connaughton we analyse continuous TTE data Fermi-GBM around time gravitational wave event GW 150914. We find that after proper accounting for low count statistics, GBM transient at 0.4 s 150914 is likely not due to an astrophysical source, but consistent with a background fluctuation, removing tension between INTEGRAL/ACS non-detection and GBM. Additionally, reanalysis other short GRBs shows without statistical modeling fluence faint events over-predicted, as...
Despite over 50 years of research, many open questions remain about the origin and nature GRBs. Polarization measurements prompt emission these extreme phenomena have long been thought to be key answering a range questions. The POLAR detector was designed produce first set detailed reliable polarization in an energy approximately 50-500 keV. During late 2016 early 2017, detected total 55 Analysis results 5 GRBs reported past. were found consistent with low or unpolarized flux. However,...
We report a framework for spectroscopic follow-up design optimizing supernova photometric classification. The strategy accounts the unavoidable mismatch between and samples, can be used even in beginning of new survey -- without any initial training set. falls under umbrella active learning (AL), class algorithms that aims to minimize labelling costs by identifying few, carefully chosen, objects which have high potential improving classifier predictions. As proof concept, we use simulated...
From 2008 July to 2009 October, the Gamma-ray Burst Monitor (GBM) on board Fermi Space Telescope has detected 320 gamma-ray bursts (GRBs). About 20% of these events are classified as short based their T90 duration below 2 s. We present here for first time time-resolved spectroscopy at timescales ms three brightest GRBs observed with GBM. The time-integrated spectra deviate from Band function, indicating existence an additional spectral component, which can be fit by a power law index ∼−1.5....
The GOES M2-class solar flare, SOL2010-06-12T00:57, was modest in many respects yet exhibited remarkable acceleration of energetic particles. flare produced an ~50 s impulsive burst hard X- and \gamma-ray emission up to at least 400 MeV observed by the Fermi GBM LAT experiments. remarkably similar X-ray high-energy time profiles suggest that most particles were accelerated energies >300 with a delay ~10 from mildly relativistic electrons, but some reached these as little ~3 s. line fluence...
Gamma-ray burst (GRB) 130427A is one of the most energetic GRBs ever observed. The initial pulse up to 2.5 s possibly brightest well-isolated observed date. A fine time resolution spectral analysis shows power-law decays peak energy from onset pulse, consistent with models internal synchrotron shock pulses. However, a strongly correlated behavior between luminosity and that inconsistent curvature effects arising in relativistic outflow. It difficult for any existing account all temporal...