The Swift X-Ray Telescope

Burrows, D. N.; Hill, J. E.; Nousek, J. A.; Wells, A.; Short, Alexander T.; Turner, Martin; Citterio, O.; Tagliaferri, G.; Chincarini, G.

doi:10.1063/1.1579408

Cited by 89 publications

(104 citation statements)

References 19 publications

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“…Data from the X-Ray Telescope (XRT, 0.2 − 10 keV, Burrows et al 2005) were analyzed with the xrtpipeline task with standard parameters. XRT was set in photon counting (PC) mode for the observations of 3C 279, ON +231, S5 0716 + 714 and single to quadruple pixel events were selected (grades 0 − 12).…”

Section: Sample Selection and Analysismentioning

confidence: 99%

Patterns of variability in γ-ray blazars

Foschini

2009

Advances in Space Research

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Preliminary results of a systematic study on the simultaneous optical-to-X-rays variability in blazars are presented. Data from Swift observations of four bright γ−ray blazars (3C 279, ON +231, S5 0716+71, PKS 2155−304) have been analyzed, compared, and discussed. Specifically, 3C 279 shows a variable flattening in the low energy part of the X-ray spectrum that appears to be confined in a specific X-ray vs optical/UV fluxes region. Some implications are shortly analyzed.

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Section: Sample Selection and Analysismentioning

confidence: 99%

Patterns of variability in γ-ray blazars

Foschini

2009

Advances in Space Research

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“…The program has been operating since December 2008 when interesting neutrino events were initially forwarded to the now-decommissioned ROTSE telescopes [33]. Starting in August 2010, the Palomar Transient Factory [34] started receiving OFU alerts, and in February 2011 the inclusion of the Swift-XRT [35], targeting GRB afterglows, marked the expansion of the program to the X-ray regime. In 2016, the program was again expanded in its optical capabilities, enabling more complete sky coverage by distributing alerts also to the MASTER telescopes [36].…”

Section: Ofu Alertsmentioning

confidence: 99%

IceCube real-time alert system

Satalecka¹

2017

AIP Conference Proceedings

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Although high-energy astrophysical neutrinos were discovered in 2013, their origin is still unknown. Aiming for the identification of an electromagnetic counterpart of a rapidly fading source, we have implemented a realtime analysis framework for the IceCube neutrino observatory. Several analyses selecting neutrinos of astrophysical origin are now operating in realtime at the detector site in Antarctica and are producing alerts for the community to enable rapid follow-up observations. The goal of these observations is to locate the astrophysical objects responsible for these neutrino signals. This paper highlights the infrastructure in place both at the South Pole site and at IceCube facilities in the north that have enabled this fast follow-up program to be implemented. Additionally, this paper presents the first realtime analyses to be activated within this framework, highlights their sensitivities to astrophysical neutrinos and background event rates, and presents an outlook for future discoveries.

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“…In order to measure the source N H , we analysed also the XRT data collected during 2012 outburst. The Swift/XRT data analysis was performed following the standard procedures [6]. For the spectral analysis we considered only the XRT data observed in window timing mode (WT) in order to have a good spectral resolution.…”

Section: Data Reductionmentioning

confidence: 99%

The non standard evolution of the Compton corona in the three 2008-2010 subsequent outbursts of the Black Hole Candidate 4U 1630-47

Capitanio¹,

Campana²,

Cesare³

et al. 2015

Proceedings of Swift: 10 Years of Discovery — PoS(SWIFT 10)

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We report on the analysis of the data collected by Swift, INTEGRAL and RXTE of the Black Hole Candidate (BHC) 4U 1630-472 during 3 consecutive outbursts occurred in 2006, 2008 and 2010, respectively. We show that, although a similar spectral and temporal behaviour in the energy range between 2-10 keV, these 3 outbursts present pronounced differences above 20 keV. In fact, the 2010 outburst extends at high energies without any detectable cut-off until 150-200 keV, while the other two previous outbursts, occurred on 2006 and 2008, are not detected at all above 20 keV. Moreover, the 2008 outburst does not show any detectable hard state in its final phases and even during the 2010 outburst, the final hard state shows some peculiarities rarely observed in other BHC. We also investigate on the peculiar huge variation of 4U 1630-472 hydrogen column density (N H ) reported in the literature using the Swift/XRT data. In fact this instrument is one of the most suitable for this purpose thanks to its lower energy coverage.

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The Swift X-Ray Telescope

Cited by 89 publications

References 19 publications

Patterns of variability in γ-ray blazars

Patterns of variability in γ-ray blazars

IceCube real-time alert system

The non standard evolution of the Compton corona in the three 2008-2010 subsequent outbursts of the Black Hole Candidate 4U 1630-47

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