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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…
Probing the accretion disk and central engine structure of NGC4258 with Suzaku and XMM-Newton observations
Christopher S. Reynolds, Michael A. Nowak, Sera Markoff +3
[abridged] We present an X-ray study of the low-luminosity active galactic nucleus (AGN) in NGC4258 using data from Suzaku, XMM-Newton, and the Swift/BAT survey. We find that signa…
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…
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…
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…
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…
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 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…
X-ray properties of an Unbiased Hard X-ray Detected Sample of AGN
Lisa M. Winter, Richard F. Mushotzky, Jack Tueller +1
The SWIFT gamma ray observatory's Burst Alert Telescope (BAT) has detected a sample of active galactic nuclei (AGN) based solely on their hard X-ray flux (14-195 keV). In this pape…
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…
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.…
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 Symbiotic System SS73 17 Seen with Suzaku
Randall K. Smith, Richard Mushotzky, Koji Mukai +3
We observed with Suzaku the symbiotic star SS73 17, motivated by the discovery by the INTEGRAL satellite and the Swift BAT survey that it emits hard X-rays. Our observations showed…
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…
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…
Suzaku Observations of Active Galactic Nuclei Detected in the Swift/BAT Survey: Discovery of "New Type" of Buried Supermassive Black Holes
Yoshihiro Ueda, Satoshi Eguchi, Yuichi Terashima +6
We present the Suzaku broad band observations of two AGNs detected by the Swift/BAT hard X-ray (>15 keV) survey that did not have previous X-ray data, Swift J0601.9-8636 and Swift…
The innermost regions of Active Galactic Nuclei - from radio to X-rays
Eduardo Ros, Matthias Kadler, Sarah Kaufmann +3
Active Galactic Nuclei (AGN) can be probed by at different regions of the electromagnetic spectrum: e.g., radio observations reveal the nature of their relativistic jets and their…
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…
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…
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…
Discovery of an Extreme MeV Blazar with the Swift Burst Alert Telescope
Rita M. Sambruna
The Burst Alert Telescope (BAT) onboard Swift detected bright emission from 15--195 keV from the source SWIFT~J0746.3+2548 (J0746 in the following), identified with the optically-f…
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 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…