Robert E. Butler
A5046139031- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Hedgehog Signaling Pathway Studies
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Dementia and Cognitive Impairment Research
- Radio Astronomy Observations and Technology
- Nuclear reactor physics and engineering
- Atmospheric Ozone and Climate
- Cancer-related Molecular Pathways
- Nonmelanoma Skin Cancer Studies
- Alzheimer's disease research and treatments
- Adaptive optics and wavefront sensing
- Superconducting Materials and Applications
- Proteoglycans and glycosaminoglycans research
- Impact of Light on Environment and Health
- Electronic Health Records Systems
- Virus-based gene therapy research
- Neurological diseases and metabolism
Indiana University Bloomington
2017-2024
University of Chicago
2020
Fermi National Accelerator Laboratory
2017-2020
Georgetown University Medical Center
2004
Georgetown University
2004
Murdoch University
2002
Naval Medical Center San Diego
1997
University College London
1995
Lockheed Martin (United States)
1994
General Electric (United States)
1992
We present UV, optical, and NIR photometry of the first electromagnetic counterpart to a gravitational wave source from Advanced LIGO/Virgo, binary neutron star merger GW170817. Our data set extends discovery optical at $0.47$ days $18.5$ post-merger, includes observations with Dark Energy Camera (DECam), Gemini-South/FLAMINGOS-2 (GS/F2), {\it Hubble Space Telescope} ({\it HST}). The spectral energy distribution (SED) inferred this $0.6$ is well described by blackbody model $T\approx 8300$...
Abstract We present the Dark Energy Camera (DECam) discovery of optical counterpart first binary neutron star merger detected through gravitational-wave emission, GW170817. Our observations commenced 10.5 hr post-merger, as soon localization region became accessible from Chile. imaged 70 deg 2 in i and z bands, covering 93% initial integrated probability, to a depth necessary identify likely counterparts (e.g., kilonova). At 11.4 post-merger we bright transient located nucleus NGC 4993 at...
Employability is an important indicator of the success academic programs, and it can be improved through intentional curricular adjustments. This paper describes three case studies, all which are aimed at increasing student employability during after completion credentials a university with open admissions that champions access to higher education among underserved populations. In one, goal was bridge disciplines by developing credential would relevant within multiple industries. Case two...
Abstract We present optical follow-up imaging obtained with the Katzman Automatic Imaging Telescope, Las Cumbres Observatory Global Telescope Network, Nickel Swope and Thacher of LIGO/Virgo gravitational wave (GW) signal from neutron star–black hole (NSBH) merger GW190814. searched GW190814 localization region (19 deg 2 for 90th percentile best localization), covering a total 51 94.6% two-dimensional region. Analyzing properties 189 transients that we consider as candidate counterparts to...
The discovery of a kilonova (KN) associated with the Advanced LIGO (aLIGO)/Virgo event GW170817 opens up new avenues multi-messenger astrophysics. Here, using realistic simulations, we provide estimates number KNe that could be found in data from past, present and future surveys without gravitational-wave trigger. For simulation, construct spectral time-series model based on DES-GW multi-band light-curve single known KN event, use an average BNS rates past studies $10^3...
Binary black hole (BBH) mergers found by the LIGO and Virgo detectors are of immense scientific interest to astrophysics community, but considered unlikely be sources electromagnetic emission. To test whether they have rapidly fading optical counterparts, we used Dark Energy Camera perform an $i$-band search for BBH merger GW170814, first gravitational wave detected three interferometers. The 87-deg$^2$ localization region (at 90\% confidence) centered in Survey (DES) footprint enabled us...
Abstract On 2019 August 14 at 21:10:39 UTC, the LIGO/Virgo Collaboration (LVC) detected a possible neutron star–black hole merger (NSBH), first ever identified. An extensive search for an optical counterpart of this event, designated GW190814, was undertaken using Dark Energy Camera on 4 m Victor M. Blanco Telescope Cerro Tololo Inter-American Observatory. Target Opportunity interrupts were issued eight separate nights to observe 11 candidates 4.1 Southern Astrophysical Research (SOAR)...
Abstract The Milky Way dust extinction curve in the near-infrared (NIR) follows a power-law form, but value of slope, β NIR , is debated. Systematic variations slope UV are known to be correlated with optical (through R V ), whether such dependence extends unclear. Finally, because low column densities, law poorly understood at high Galactic latitudes where most extragalactic work takes place. In this paper, we construct curves from 56,649 stars Sloan Digital Sky Survey (SDSS) and Two Micron...
The initiation of premalignant lesions is associated with subtle cellular and gene expression changes. Here we describe a severe combined immunodeficient mouse xenograft model human adult skin compare chemical carcinogenesis wound healing. We focus on secreted binding protein for fibroblast growth factors (FGF-BP) that enhances the activity locally stored FGFs expressed at high levels in epithelial cancers. Carcinogen treatment murine induced papilloma within 6 weeks, whereas grafts...
Abstract On 2019 August 14, the LIGO and Virgo Collaborations detected gravitational waves from a black hole 2.6 solar mass compact object, possibly first neutron star–black merger. In search of an optical counterpart, Dark Energy Survey (DES) obtained deep imaging entire 90% confidence level localization area with Blanco/DECam 0, 1, 2, 3, 6, 16 nights after Objects varying brightness were by DES Pipeline, we systematically reduced candidate counterparts through catalog matching, light-curve...
An 18‐month‐old, male greylag goose was presented for assessment of multiple, semi‐pedunculated cutaneous masses limited to non‐feathered areas skin. Initial biopsy and histopathology revealed a mesenchymal neoplasm suggestive lipoblastomatosis or atypical xanthoma. Immunohistochemistry unsuccessful in determining the tissue type origin. Surgical resection all prevented by mucocutaneous location several masses. Chemotherapy using intralesion cisplatin resolving but well‐tolerated goose....
Abstract Single photon emission computed tomography (SPECT) and magnetic resonance (MR) imaging data were obtained in 11 patients with dementia of the Alzheimer type (DAT), multi‐infarct (MID) nine elderly, healthy controls. All tolerated a 15‐minute SPECT scan while six (27%) did not tolerate MR examination due to long acquisition times and/or claustrophobia. Blind qualitative rating scans differentiated correctly between controls 90% cases ( p < 0.0001; positive predicted value 91%)...
Abstract The gas-to-dust ratio of reddened stars in the Milky Way (MW), Magellanic Clouds, and general, is usually expressed as a linear relation between hydrogen column density, N (H), reddening, E ( B − V ), or extinction V- band A ). If curve were truly universal, strength relationship linearity would naturally be maintained for at any wavelength, well (H) versus However, curves vary within MW, there no reason, except by chance, why either ) most physical measure dust density. In this...
Gravitational wave (GW) events have several possible progenitors, including black hole mergers, cosmic string cusps, supernovae, neutron star and hole–neutron mergers. A subset of GW are expected to produce electromagnetic (EM) emission that, once detected, will provide complementary information about their astrophysical context. To that end, the LIGO-Virgo Collaboration has partnered with other teams send candidate alerts so searches for EM counterparts can be pursued. One such partner is...
The Access to Health Records Act came into force on 1 November 1991. This legislation allows patients access their written medical records (access computerised is covered by separate legislation). Concerns have been expressed about the implications of this for staff and patients, particularly in psychiatry. These concerns included detrimental effects exposed notes restrictions it could place upon recording speculation or subjective opinion. We report following findings: attitudes new...
GE has developed a high temperature fuel pin for the SP‐100 Space Reactor. The Nb‐1% Zr alloy PWC‐11 was selected over conventional Ar cladding because higher creep strength enables significant reduction in system mass. 0.1% carbon to provide and tensile at operating temperature. by Pratt Whitney 1960’s it also been investigated Russians.Six small 35 pound ingots were purchased from Teledyne Wah Chang, five Nasa Lewis Research Center, one SP‐100. Since no work had done during last two...
The Milky Way extinction curve in the near-infrared (NIR) follows a power law form, but value of slope, $\beta_\text{NIR}$, is debated. Systematic variations slope UV are known to be correlated with optical (through $R_V$), whether such dependence extends NIR unclear. Finally, because low dust column densities, essentially unconstrained at high Galactic latitudes where most extragalactic work takes place. In this paper, we construct curves from 56,649 stars SDSS and 2MASS photometry, based...