Publications (54)
Spectral Cross-calibration of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT Data using Gamma-Ray Bursts
T. Sakamoto, V. Pal'shin, K. Yamaoka +20
We report on the spectral cross-calibration results of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT instruments using simultaneously observed gamma-ray bursts (GRBs). This is…
Probing the Nature of Short Swift Bursts via Deep INTEGRAL Monitoring of GRB 050925
T. Sakamoto, L. Barbier, S. D. Barthelmy +10
We present results from Swift, XMM-Newton, and deep INTEGRAL monitoring in the region of GRB 050925. This short Swift burst is a candidate for a newly discovered soft gamma-ray rep…
Mid-Infrared Properties of the Swift Burst Alert Telescope Active Galactic Nuclei Sample of the Local Universe. I. Emission-Line Diagnostics
K. A. Weaver, M. Meléndez, R. F. Mushotzky +9
We compare mid-infrared emission-line properties, from high-resolution Spitzer spectra of a hard X-ray (14 -- 195 keV) selected sample of nearby (z < 0.05) AGN detected by the Burs…
Are Short GRBs Really Hard?
T. Sakamoto, L. Barbier, S. Barthelmy +19
Thanks to the rapid position notice and response by HETE-2 and Swift, the X-ray afterglow emissions have been found for four recent short gamma-ray bursts (GRBs; GRB 050509b, GRB 0…
Global Properties of X-Ray Flashes and X-Ray-Rich Gamma-Ray Bursts Observed by Swift
T. Sakamoto, D. Hullinger, G. Sato +14
We describe and discuss the spectral and temporal characteristics of the prompt emission and X-ray afterglow emission of X-ray flashes (XRFs) and X-ray-rich gamma-ray bursts (XRRs)…
Swift and optical observations of GRB 050401
Massimiliano De Pasquale, Andy P. Beardmore, S. D. Barthelmy +22
We present the results of the analysis of gamma-ray and X-ray data of GRB 050401 taken with the Swift satellite, together with a series of ground-based follow-up observations. The…
Correlations of Prompt and Afterglow Emission in Swift Long and Short Gamma Ray Bursts
N. Gehrels, S. D. Barthelmy, D. N. Burrows +12
Correlation studies of prompt and afterglow emissions from gamma-ray bursts (GRBs) between different spectral bands has been difficult to do in the past because few bursts had comp…
The Infocus Hard X-ray Telescope: Pixellated CZT Detector/Shield Performance and Flight Results
Wayne H. Baumgartner, J. Tueller, H. Krimm +9
The CZT detector on the Infocus hard X-ray telescope is a pixellated solid-state device capable of imaging spectroscopy by measuring the position and energy of each incoming photon…
Gamma-Ray Emission from the Broad-Line Radio Galaxy 3C111
R. C. Hartman, M. Kadler, J. Tueller
The broad-line radio galaxy 3C111 has been suggested as the counterpart of the gamma-ray source 3EGJ0416+3650. While 3C111 meets most of the criteria for a high-probability identif…
DUAL Gamma-Ray Mission
S. Boggs, C. Wunderer, P. von Ballmoos +30
Gamma-ray astronomy presents an extraordinary scientific potential for the study of the most powerful sources and the most violent events in the Universe. In order to take full adv…
The BAT-Swift Science Software
D. M. Palmer, E. Fenimore, M. Galassi +22
The BAT instrument tells the Swift satellite where to point to make immediate follow-up observations of GRBs. The science software on board must efficiently process gamma-ray event…
Epeak estimator for Gamma-Ray Bursts Observed by the Swift Burst Alert Telescope
T. Sakamoto, G. Sato, L. Barbier +13
We report a correlation based on a spectral simulation study of the prompt emission spectra of gamma-ray bursts (GRBs) detected by the Swift Burst Alert Telescope (BAT). The correl…
The Evolution of Swift/BAT blazars and the origin of the MeV background
M. Ajello, L. Costamante, R. M. Sambruna +8
We use 3 years of data from the Swift/BAT survey to select a complete sample of X-ray blazars above 15 keV. This sample comprises 26 Flat-Spectrum Radio Quasars (FSRQs) and 12 BL L…
The 70 Month Swift-BAT All-Sky Hard X-Ray Survey
W. H. Baumgartner, J. Tueller, C. B. Markwardt +5
We present the catalog of sources detected in 70 months of observations of the BAT hard X-ray detector on the Swift gamma-ray burst observatory. The Swift-BAT 70 month survey has d…
X-ray vs. water maser emission in AGN
P. Castangia, A. Tilak, M. Kadler +3
Correlations between X-ray and water maser emission in AGN have been recently reported. However, the lack of systematic studies affects the confidence level of these results. In th…
Swift BAT Survey of AGN
J. Tueller, R. F. Mushotzky, S. Barthelmy +5
We present the results of the analysis of the first 9 months of data of the Swift BAT survey of AGN in the 14-195 keV band. Using archival X-ray data or follow-up Swift XRT observa…
BAT X-ray Survey - III: X-ray Spectra and Statistical Properties
M. Ajello, A. Rau, J. Greiner +7
In this concluding part of the series of three papers dedicated to the Swift/BAT hard X-ray survey (BXS), we focus on the X-ray spectral analysis and statistical properties of the…
The Second Swift BAT Gamma-Ray Burst Catalog
T. Sakamoto, S. D. Barthelmy, W. H. Baumgartner +12
We present the second Swift Burst Alert Telescope (BAT) catalog of gamma-ray bursts (GRBs), which contains 476 bursts detected by the BAT between 2004 December 19 and 2009 December…
Swift Observations of Hard X-ray Emitting White Dwarfs in Symbiotic Stars
J. A. Kennea, K. Mukai, J. L. Sokoloski +4
The X-ray emission from most accreting white dwarfs (WDs) in symbiotic binary stars is quite soft. Several symbiotic WDs, however, produce strong X-ray emission at energies greater…
Investigating the Possibility of Screening High-z GRBs based on BAT Prompt Emission Properties
T. N. Ukwatta, T. Sakamoto, K. S. Dhuga +5
Being able to quickly select among gamma-ray bursts (GRBs) seen by the Swift satellite those which are high-z candidates would give ground-based observers a better chance to determ…
Suzaku Observations of Four Heavily Absorbed HMXBs
D. C. Morris, R. K. Smith, C. B. Markwardt +4
We report on Suzaku observations of four unidentified sources from the INTEGRAL and Swift BAT Galactic plane surveys. All the sources have a large neutral hydrogen column density a…
The Hard X-ray Polarimeter X-Calibur - Design and Tests
M. Beilicke, W. R. Binns, J. Buckley +17
X-ray polarimetry promises to give new information about high-energy astrophysical sources, such as binary black hole systems, micro-quasars, active galactic nuclei, and gamma-ray…
A Link between Prompt Optical and Prompt Gamma-Ray Emission in Gamma-Ray Bursts
W. T. Vestrand, P. R. Wozniak, J. A. Wren +20
The prompt optical emission that arrives with gamma-rays from a cosmic gamma-ray burst (GRB) is a signature of the engine powering the burst, the properties of the ultra-relativist…
Nonthermal Hard X-ray Emission and Iron Kalpha Emission from a Superflare on II Pegasi
R. A. Osten, S. Drake, J. Tueller +4
We report on an X-ray flare detected on the active binary system II~Pegasi with the Swift telescope. The trigger had a 10-200 keV luminosity of 2.2 erg s-- a…
Cosmic X-ray background and Earth albedo Spectra with Swift/BAT
M. Ajello, J. Greiner, G. Sato +8
We use Swift/BAT Earth occultation data at different geomagnetic latitudes to derive a sensitive measurement of the Cosmic X-ray background (CXB) and of the Earth albedo emission i…
A Comparison of the Variability of the Symbiotic X-ray Binaries GX 1+4, 4U 1954+31, and 4U 1700+24 from Swift/BAT and RXTE/ASM Observations
R. H. D. Corbet, J. L. Sokoloski, K. Mukai +2
We present an analysis of the X-ray variability of three symbiotic X-ray binaries, GX 1+4, 4U 1700+24, and 4U 1954+31, using observations made with the Swift Burst Alert Telescope…
Gamma-Ray Observations of a Giant Flare from The Magnetar SGR 1806-20
D. M. Palmer, S. Barthelmy, N. Gehrels +25
Magnetars comprise two classes of rotating neutron stars (Soft Gamma Repeaters (SGRs) and Anomalous X-ray Pulsars), whose X-ray emission is powered by an ultrastrong magnetic field…
Gamma-ray limits on Galactic 60Fe nucleosynthesis and implications on the Origin of the 26Al emission
J. E. Naya, S. D. Barthelmy, L. M. Bartlett +5
The Gamma Ray Imaging Spectrometer (GRIS) recently observed the gamma-ray emission from the Galactic center region. We have detected the 1809 keV Galactic 26Al emission at a signif…
Confirmation of the $\eps$ -- $\eiso$ (Amati) relation from the X-ray flash XRF 050416A observed by Swift/BAT
T. Sakamoto, L. Barbier, S. D. Barthelmy +10
We report Swift Burst Alert Telescope (BAT) observations of the X-ray Flash (XRF) XRF 050416A. The fluence ratio between the 15-25 keV and 25-50 keV energy bands of this event is 1…
The Trigger Algorithm for the Burst Alert Telescope on Swift
E. Fenimore, D. Palmer, M. Galassi +5
The Swift Burst Alert Telescope (BAT) is a huge (5200 cm2) coded aperture imager that will detect gamma-ray bursts in real time and provide a location that the Swift satellite will…
X-Raying the MOJAVE Sample of Compact Extragalactic Radio Jets
M. Kadler, G. Sato, J. Tueller +4
The MOJAVE sample is the first large radio-selected, VLBI-monitored AGN sample for which complete X-ray spectral information is being gathered. We report on the status of Swift sur…
A contemporaneous infrared flash from a long gamma-ray burst: an echo from the central engine
C. H. Blake, J. S. Bloom, D. L. Starr +25
The explosion that results in a cosmic gamma-ray burst (GRB) is thought to produce emission from two physical processes -- the activity of the central engine gives rise to the high…
Swift/BAT and RXTE Observations of the Peculiar X-ray Binary 4U 2206+54 - Disappearance of the 9.6 Day Modulation
R. H. D. Corbet, C. B. Markwardt, J. Tueller
Observations of the high-mass X-ray binary 4U 2206+54 with the Swift Burst Alert Telescope (BAT) do not show modulation at the previously reported period of 9.6 days found from obs…
Design and tests of the hard X-ray polarimeter X-Calibur
M. Beilicke, M. G. Baring, S. Barthelmy +17
X-ray polarimetry promises to give qualitatively new information about high-energy astrophysical sources, such as binary black hole systems, micro-quasars, active galactic nuclei,…
The 22-Month Swift-BAT All-Sky Hard X-ray Survey
J. Tueller, W. H. Baumgartner, C. B. Markwardt +36
We present the catalog of sources detected in the first 22 months of data from the hard X-ray survey (14--195 keV) conducted with the BAT coded mask imager on the \swift satellite.…
First high energy observations of Narrow Line Seyfert 1s with INTEGRAL/IBIS
A. Malizia, L. Bassani, A. J. Bird +8
Narrow Line Seyfert 1 galaxies (NLS1) are very interesting objects which display peculiar properties when compared to their broad line analogues (BLS1). Although well studied in ma…
The Simultaneous Low State Spectral Energy Distribution of 1ES 2344+514 from Radio to Very High Energies
MAGIC Collaboration, J. AleksiÄ, L. A. Antonelli +191
[Abridged] Context. To construct and interpret the spectral energy distribution (SED) of BL Lacertae objects, simultaneous broad-band observations are mandatory. Aims. We present t…
Swift's Ability to Detect Gamma-Ray Bursts
E. E. Fenimore, K. McLean, D. Palmer +7
The Swift satellite will be a self-contained observatory that will bring new capabilities to the observing of the early afterglow emission of Gamma-ray Bursts. Swift is completely…
Long-term variability of AGN at hard X-rays
S. Soldi, V. Beckmann, W. H. Baumgartner +6
Variability at all observed wavelengths is a distinctive property of AGN. Hard X-rays provide us with a view of the innermost regions of AGN, mostly unbiased by absorption along th…
The Swift/BAT High Latitude Survey: First Results
C. B. Markwardt, J. Tueller, G. K. Skinner +3
We present preliminary results from the first 3 months of the Swift BAT high galactic latitude survey in the 14--195 keV band. The survey reaches a flux of \~10^{-11} erg/cm^2/s an…
X-ray Spectral Properties of the BAT AGN Sample
L. M. Winter, R. Mushotzky, C. S. Reynolds +1
The 9-month Swift Burst Alert Telescope (BAT) catalog provides the first unbiased (log N_H < 24) look at local (<z> = 0.03) AGN. In this paper, we present the collected X-ray prope…
Swift observations of high-redshift radio-loud quasars
R. M. Sambruna, F. Tavecchio, G. Ghisellini +5
We report on Swift observations of four z>2 radio-loud quasars (0212+735, 0537-286, 0836+710, and 2149-307), classified as blazars. The sources, well-known emitters at soft-medium…
OSSE Observations of the Soft Gamma Ray Continuum from the Galactic Plane at Longitude 95 Degrees
J. G. Skibo, W. N. Johnson, J. D. Kurfess +7
We present the results of OSSE observations of the soft gamma ray continuum emission from the Galactic plane at longitude 95 degrees. Emission is detected between 50 and 600 keV wh…
Periodicities in X-ray Binaries from Swift/BAT Observations
R. Corbet, C. Markwardt, L. Barbier +8
The Burst Alert Telescope (BAT) on board Swift has accumulated extensive light curves for 265 sources (not including GRBs) in the energy range 14 to 200 keV. We present here a summ…
Spectral Analysis of the Accretion Flow in NGC 1052 with Suzaku
L. W. Brenneman, K. A. Weaver, M. Kadler +10
We present an analysis of the 101 ks, 2007 Suzaku spectrum of the LINER galaxy NGC 1052. The 0.5-10 keV continuum is well-modeled by a power-law modified by Galactic and intrinsic…
Suzaku observation of the LINER NGC 4102
O. Gonzalez-Martin, I. Papadakis, V. Braito +11
Low ionisation nuclear emission-line region (LINER) nuclei have been claimed to be different than other active galactic nuclei (AGN) due to the presence of complex absorbing struct…
Correlations of the IR Luminosity and Eddington Ratio with a Hard X-ray Selected Sample of AGN
R. F. Mushotzky, L. M. Winter, D. H. McIntosh +1
We use the SWIFT Burst Alert Telescope (BAT) sample of hard x-ray selected active galactic nuclei (AGN) with a median redshift of 0.03 and the 2MASS J and K band photometry to exam…
New Indicators for AGN Power: The Correlation Between [O IV] lambda 25.89 micron and Hard X-ray Luminosity for Nearby Seyfert Galaxies
M. Meléndez, S. B. Kraemer, B. K Armentrout +7
We have studied the relationship between the [O IV] lambda 25.89 micron emission line luminosities, obtained from Spitzer spectra, the X-ray continua in the 2-10 keV band, primaril…
Hard X-ray Variability of AGN
V. Beckmann, S. D. Barthelmy, T. J. -L. Courvoisier +4
Aims: Active Galactic Nuclei are known to be variable throughout the electromagnetic spectrum. An energy domain poorly studied in this respect is the hard X-ray range above 20 keV.…
The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
S. D. Barthelmy, L. M. Barbier, J. R. Cummings +12
The Burst Alert Telescope (BAT) is one of 3 instruments on the Swift MIDEX spacecraft to study gamma-ray bursts (GRBs). The BAT first detects the GRB and localizes the burst direct…
Discovery of the accretion-powered millisecond pulsar SWIFT J1756.9-2508 with a low-mass companion
H. A. Krimm, C. B. Markwardt, C. J. Deloye +10
We report on the discovery by the Swift Gamma-Ray Burst Explorer of the eighth known transient accretion-powered millisecond pulsar, SWIFT J1756.9-2508, as part of routine observat…
The First Swift BAT Gamma-Ray Burst Catalog
T. Sakamoto, S. D. Barthelmy, L. Barbier +13
We present the first Swift Burst Alert Telescope (BAT) catalog of gamma-ray bursts (GRBs), which contains bursts detected by the BAT between 2004 December 19 and 2007 June 16. This…
Structure of the Accretion Flow in Broad-Line Radio Galaxies: The Case of 3C390.3
R. M. Sambruna, J. N. Reeves, V. Braito +8
We present XMM and Suzaku observations of the Broad-Line Radio Galaxy (BLRG) 3C390.3. The Fe Ka line has a width FWHM ~ 8,800 km/s, consistent within a factor two with the width of…
Galaxy Clusters in the Swift/BAT era: Hard X-rays in the ICM
M. Ajello, P. Rebusco, N. Cappelluti +6
We report about the detection of 10 clusters of galaxies in the ongoing Swift/BAT all-sky survey. This sample, which comprises mostly merging clusters, was serendipitously detected…