A5066153541- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- SAS software applications and methods
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Particle physics theoretical and experimental studies
- Astro and Planetary Science
- Nuclear physics research studies
- Veterinary Orthopedics and Neurology
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Geophysics and Gravity Measurements
- Knee injuries and reconstruction techniques
- Hip disorders and treatments
- X-ray Spectroscopy and Fluorescence Analysis
- High-pressure geophysics and materials
- Tendon Structure and Treatment
- Radio Wave Propagation Studies
Pennsylvania State University
2016-2025
The University of Texas at Arlington
2021-2024
Lawrence Berkeley National Laboratory
2023-2024
Southern University and Agricultural and Mechanical College
2021-2024
Clark Atlanta University
2021-2024
University of Alaska Anchorage
2021-2024
Providence College
2021-2024
University of Missouri
2011-2023
UCLouvain
2023
University of Wisconsin–Madison
2023
A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of exciting science opportunities next decade. The Large Synoptic Survey Telescope (LSST) have an effective aperture 6.7 meters and imaging camera field view 9.6 deg^2, be devoted ten-year 20,000 deg^2 south +15 deg. Each pointing imaged 2000 times fifteen second exposures six broad from 0.35 1.1 microns, total point-source depth r~27.5. LSST Science Book describes basic...
The Palomar Transient Factory (PTF) is a fully-automated, wide-field survey aimed at systematic exploration of the optical transient sky. performed using new 8.1 square degree camera installed on 48-inch Samuel Oschin telescope Observatory; colors and light curves for detected transients are obtained with automated 60-inch telescope. PTF uses eighty percent 1.2-m fifty 1.5-m time. With an exposure 60-s reaches depth approximately 21.3 in g' 20.6 R (5 sigma, median seeing). Four major...
The Palomar Transient Factory (PTF) is a wide-field experiment designed to investigate the optical transient and variable sky on time scales from minutes years. PTF uses CFH12k mosaic camera, with field of view 7.9 deg2 plate scale 1'' pixel-1, mounted Observatory 48 inch Samuel Oschin Telescope. operation strategy devised probe existing gaps in phase space search for theoretically predicted, but not yet detected, phenomena, such as fallback supernovae, macronovae,. Ia orphan afterglows...
With its rapid-response capability and multiwavelength complement of instruments, the Swift satellite has transformed our physical understanding gamma-ray bursts (GRBs). Providing high-quality observations hundreds bursts, facilitating a wide range follow-up within seconds each event, revealed an unforeseen richness in observed burst properties, shed light on nature short-duration helped realize promise GRBs as probes processes environments star formation out to earliest cosmic epochs. These...
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...
Gamma-ray bursts (GRBs) serve as powerful probes of the early Universe, with their luminous afterglows revealing locations and physical properties star forming galaxies at highest redshifts, potentially locating first generation (Population III) stars. Since GRB have intrinsically very simple spectra, they allow robust redshifts from low signal to noise spectroscopy, or photometry. Here we present a photometric redshift z~9.4 for Swift-detected 090429B based on deep observations...
This Letter presents the results from pointlike neutrino source searches using ten years of IceCube data collected between April 6, 2008 and July 10, 2018. We evaluate significance an astrophysical signal a looking for excess clustered events with energies typically above ∼1 TeV among background atmospheric muons neutrinos. perform full-sky scan, search within selected catalog, catalog population study, three stacked Galactic searches. The most significant point in northern hemisphere...
The IceCube Neutrino Observatory has established the existence of a high-energy all-sky neutrino flux astrophysical origin. This discovery was made using events interacting within fiducial region detector surrounded by an active veto and with reconstructed energy above 60 TeV, commonly known as starting event sample, or HESE. We revisit analysis HESE sample additional 4.5 years data, newer glacial ice models, improved systematics treatment. paper describes in detail, reports on latest...
We present detailed optical photometry for 25 Type Ibc supernovae (SNe Ibc) within d ≈ 150 Mpc obtained with the robotic Palomar 60 inch telescope in 2004–2007. This study represents first uniform, systematic, and statistical sample of multi-band SNe light curves available to date. correct host galaxy extinction using a new technique based on photometric color evolution, namely, we show that (V − R) extinction-corrected at Δt 10 days after V-band maximum is tightly distributed, 〈(V R)V10〉 =...
We present comprehensive multiwavelength observations of three gamma-ray bursts (GRBs) with durations several thousand seconds. demonstrate that these events are extragalactic transients; in particular we resolve the long-standing conundrum distance GRB 101225A (the "Christmas-day burst"), finding it to have a redshift z=0.847, and showing two apparently similar (GRB 111209A 121027A) lie at z=0.677 z=1.773 respectively. The systems show extremely unusual X-ray optical lightcurves, very...
Type IIn supernovae (SNe IIn) are rare events, constituting only a few percent of all core-collapse SNe, and the current sample well-observed SNe is small. Here, we study four observed by Caltech Core-Collapse Project (CCCP). The CCCP SN unbiased to extent that object selection was not influenced target properties. Therefore, these events representative population IIn. We find narrow P-Cygni profile in hydrogen Balmer lines appears be ubiquitous feature Our light curves show relatively long...
Abstract Detection of the IceCube-170922A neutrino coincident with flaring blazar TXS 0506+056, first and only ∼3 σ high-energy source association to date, offers a potential breakthrough in our understanding cosmic particles physics. We present comprehensive analysis 0506+056 during its state, using newly collected Swift , NuSTAR X-shooter data Fermi observations numerical models constrain blazar’s particle acceleration processes multimessenger (electromagnetic (EM) neutrino) emissions....
We report on the first measurement of astrophysical neutrino flux using particle showers (cascades) in IceCube data from 2010-2015. Assuming standard oscillations, neutrinos this dedicated cascade sample are dominated (∼90%) by electron and tau flavors. The flux, observed sensitive energy range 16 TeV to 2.6 PeV, is consistent with a single power-law model as expected Fermi-type acceleration high particles at sources. find spectral index be γ=2.53±0.07 normalization for each flavor...
Abstract We present a comprehensive optical and near-infrared census of the fields 90 short gamma-ray bursts (GRBs) discovered in 2005–2021, constituting all GRBs for which host galaxy associations are feasible (≈60% total Swift GRB population). contribute 274 new multi-band imaging observations across 58 distinct 26 spectra their galaxies. Supplemented by literature archival survey data, catalog contains 542 photometric 42 spectroscopic data sets. The reaches 3 σ depths ≳24–27 mag ≳23–26...
Gamma-ray bursts (GRBs) have long been considered a possible source of high-energy neutrinos. While no correlations yet detected between neutrinos and GRBs, the recent observation GRB 221009A - brightest observed by Fermi-GBM to date first one be above an energy 10 TeV provides unique opportunity test for hadronic emission. In this paper, we leverage wide range IceCube Neutrino Observatory search from 221009A. We find significant deviation background expectation across event samples ranging...