A5048905624- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- SAS software applications and methods
- Planetary Science and Exploration
- Particle Accelerators and Free-Electron Lasers
- Particle physics theoretical and experimental studies
- Geophysics and Gravity Measurements
- Nuclear Physics and Applications
- Isotope Analysis in Ecology
- Statistical and numerical algorithms
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Cosmology and Gravitation Theories
- Laser-Plasma Interactions and Diagnostics
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Geomagnetism and Paleomagnetism Studies
- Hungarian Social, Economic and Educational Studies
University of Alabama in Huntsville
2015-2024
University of Miskolc
2020-2023
Goddard Space Flight Center
2023
Kavli Institute for Particle Astrophysics and Cosmology
2023
Stanford University
2017-2023
SLAC National Accelerator Laboratory
2023
University of Maryland, Baltimore County
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2023
University College Cork
2010-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2023
On August 17, 2017 at 12:41:06 UTC the Fermi Gamma-ray Burst Monitor (GBM) detected and triggered on short gamma-ray burst GRB 170817A. Approximately 1.7 s prior to this GRB, Laser Interferometer Gravitational-Wave Observatory (LIGO) a binary compact merger candidate associated with GRB. This is first unambiguous coincident observation of gravitational waves electromagnetic radiation from single astrophysical source marks start gravitational-wave multi-messenger astronomy. We report GBM...
With an instantaneous view of 70% the sky, Fermi Gamma-ray Burst Monitor (GBM) is excellent partner in search for electromagnetic counterparts to gravitational wave (GW) events. GBM observations at time Laser Interferometer Gravitational-wave Observatory (LIGO) event GW150914 reveal presence a weak transient above 50 keV, 0.4~s after GW event, with false alarm probability 0.0022 (2.9$\sigma$). This lasting 1 s was not detected by any other instrument and does appear connected previously...
We present the fourth in a series of catalogs gamma-ray bursts (GRBs) observed with Fermi's Gamma-Ray Burst Monitor (Fermi-GBM). It extends six year catalog by four more years, now covering ten time period from trigger enabling on 2008 July 12 to 2018 11. During this GBM triggered almost twice day transient events which we identifyied 2356 as cosmic GRBs. Additional were due solar are events, magnetar burst activities, and terrestrial flashes. The intention GRB is provide updated information...
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,...
Abstract GRB 221009A has been referred to as the brightest of all time (BOAT). We investigate veracity this statement by comparing it with a half century prompt gamma-ray burst observations. This is ever detected measures peak flux and fluence. Unexpectedly, highest isotropic-equivalent total energy identified, while luminosity at ∼99th percentile known distribution. explore how such can be powered discuss potential implications for ultralong high-redshift bursts. By geometric extrapolation...
Abstract We report the discovery of GRB 221009A, highest flux gamma-ray burst (GRB) ever observed by Fermi Gamma-ray Burst Monitor (Fermi-GBM). This has continuous prompt emission lasting more than 600 s, which smoothly transitions to afterglow visible in Fermi-GBM energy range (8 keV–40 MeV), and total energetics higher any other sample. By using a variety new existing analysis techniques we probe spectral temporal evolution 221009A. find no prior trigger time ( t 0 ; 2022 October 9 at...
We describe the Pan-STARRS Moving Object Processing System (MOPS), a modern software package that produces automatic asteroid discoveries and identifications from catalogs of transient detections next-generation astronomical survey telescopes. MOPS achieves > 99.5% efficiency in producing orbits synthetic but realistic population asteroids whose measurements were simulated for Pan-STARRS4-class telescope. Additionally, using non-physical grid population, we demonstrate can detect populations...
Abstract We present the systematic spectral analyses of gamma-ray bursts (GRBs) detected by Fermi Gamma-Ray Burst Monitor during its first ten years operation. This catalog contains two types spectra: time-integrated fits and at brightest time bin, from 2297 GRBs, resulting in a compendium over 18,000 spectra. The four different models used for fitting spectra were selected based on their empirical importance to shape many GRBs. describe detail our procedure criteria analyses, bulk results...
Abstract Cosmological gamma-ray bursts (GRBs) are known to arise from distinct progenitor channels: short GRBs mostly neutron star mergers and long a rare type of core-collapse supernova (CCSN) called collapsars. Highly magnetized stars magnetars also generate energetic, short-duration transients magnetar giant flares (MGFs). Three have been observed the Milky Way its satellite galaxies, they suspected constitute third class extragalactic GRBs. We report unambiguous identification population...
Abstract We present the IXPE observation of GRB 221009A, which includes upper limits on linear polarization degree both prompt and afterglow emission in soft X-ray energy band. 221009A is an exceptionally bright gamma-ray burst (GRB) that reached Earth 2022 October 9 after traveling through dust Milky Way. The Imaging Polarimetry Explorer (IXPE) pointed at 11 to observe, for first time, 2–8 keV a afterglow. set limit 13.8% 99% confidence level. This result provides constraints jet opening...
Magnetars are slowly rotating neutron stars that possess the strongest magnetic fields known in cosmos (10 14 − 10 15 G). They display a range of transient high-energy electromagnetic activity. The brightest and most energetic these events gamma-ray bursts (GRBs) as magnetar giant flares (MGFs), with isotropic energies E iso ≈ 44 46 erg. Only seven MGF detections have been made to date: three unambiguous occurred our Galaxy Magellanic Clouds, other four candidates associated nearby...
Abstract We present Fermi Gamma-ray Burst Monitor (Fermi-GBM) and Swift Alert Telescope (Swift-BAT) searches for gamma-ray/X-ray counterparts to gravitational-wave (GW) candidate events identified during the third observing run of Advanced LIGO Virgo detectors. Using Fermi-GBM onboard triggers subthreshold gamma-ray burst (GRB) candidates found in ground analyses, Targeted Search Untargeted Search, we investigate whether there are any coincident GRBs associated with GWs. also search...
Since their first discovery in the late 1960s, gamma-ray bursts have attracted an exponentially growing interest from international community due to central role most highly debated open questions of modern research astronomy, astrophysics, cosmology, and fundamental physics. These range intimate nuclear composition high-density material within core ultra-dense neuron stars, stellar evolution via collapse massive production propagation gravitational waves, as well exploration early universe...
Earlier classification analyses found three types of gamma-ray bursts (short, long and intermediate in duration) the BATSE sample. Recent works have shown that these groups are also present RHESSI BeppoSAX databases. The duration distribution analysis observed by Swift satellite favors three-component model. In this paper, we extend data with spectral information. We show, using hardness simultaneously, maximum likelihood method against two-component shows a fourth component is not needed.
We aim to obtain high-quality time-resolved spectral fits of gamma-ray bursts (GRBs) observed by the Gamma-ray Burst Monitor (GBM) on board Fermi Space Telescope. perform analysis with high temporal and resolution brightest GBM in its first 4 years mission. present complete catalog containing 1,491 spectra from 81 resolution. Distributions parameters, statistics parameter populations, parameter-parameter parameter-uncertainty correlations, their exact values are obtained presented as main...
Abstract Very high energy (VHE) emission is usually interpreted in the synchrotron self-Compton scenario and expected from low-redshift high-luminosity gamma-ray bursts (GRBs), such as GRB 180720B 190114C. Recently, H.E.S.S. telescopes reported VHE one of closest bursts, 190829A, which was associated with supernova 2019oyw. In this paper, we present a temporal spectral analysis optical bands to Fermi-LAT range over multiple observational periods beginning after trigger time extending for...
The detection of TeV gamma-ray bursts (GRBs) brought new opportunities for studying the physics particle acceleration at relativistic shocks. \hess telescopes recently observed very-high-energy (VHE) emission from a nearby low-luminosity GRB, GRB 190829A. Follow-up observations with, e.g., Swift-XRT, revealed unusual flare activities $\sim 10^3\rm~s$, which can be caused by long-lasting central engine. We show that VHE during H.E.S.S. observation time is naturally produced in external...
Abstract We present the discovery of radio afterglow short gamma-ray burst (GRB) 210726A, localized to a galaxy at photometric redshift z ∼ 2.4. While observations commenced ≲1 day after burst, no emission was detected until ∼11 days. The subsequently brightened by factor ∼3 in span week, followed rapid decay (a “radio flare”). find that forward shock model cannot self-consistently describe multiwavelength X-ray and data, underpredicts flux flare ≈5. addition substantial energy injection,...
Abstract GW230529 is the first compact binary coalescence detected by LIGO–Virgo–KAGRA collaboration with at least one component mass confidently in lower gap, corresponding to range 3–5 M ⊙ . If interpreted as a neutron star–black hole merger, this event has most symmetric ratio so far and therefore relatively high probability of producing electromagnetic (EM) emission. However, no EM counterpart been reported. At merger time t 0 , Swift-BAT Fermi-GBM together covered 100% sky. Performing...
Magnetar giant flares (MGFs) are the extremely short, energetic transients originating from highly magnetized neutron stars. When observed in nearby galaxies, these rare events nearly indistinguishable cosmological short gamma-ray bursts. We present analysis of GRB,231115A, a candidate extragalactic MGF by and localized to starburst galaxy M82. This burst exhibits distinctive temporal spectral characteristics, including duration high peak energy, consistent with known MGFs. Time-resolved...
We have created a new image analysis pipeline to reprocess images taken by the Near Earth Asteroid Tracking survey and applied it ten nights of observations. This work is first large-scale reprocessing from an asteroid discovery in which thousands archived are re-calibrated, searched for minor planets, resulting observations reported Minor Planet Center. describe software used extract, calibrate, clean sources images, including specific techniques that accommodate unique features these...
Main belt asteroid (300163) 2006 VW139 (later designated P/2006 VW139) was discovered to exhibit comet-like activity by the Pan-STARRS1 survey telescope using automated point-spread-function analyses performed PS1's Moving Object Processing System. Deep follow-up observations show both a short (\sim 10") antisolar dust tail and longer 60") trail aligned with object's orbit plane, similar morphology observed for another main-belt comet, P/2010 R2 (La Sagra), other well-established comets,...
Gamma-ray bursts are the most luminous events in Universe. Going beyond short-long classification scheme we work context of three burst populations with third group intermediate duration and softest spectrum. We looking for physical properties which discriminate from other two classes. use maximum likelihood fits to establish memberships duration-hardness plane. To confirm these results also k-means hierarchical clustering. Monte-Carlo simulations test significance existence find it 99.8%...