The Burst Alert Telescope (BAT) on the SWIFT Midex Mission

Barthelmy, S. D.; Barbier, L.; Cummings, J. R.; Fenimore, E. E.; Gehrels, N.; Hullinger, D.; Krimm, H. A.; Markwardt, C.; Palmer, D. M.; Parsons, A.; Sato, G.; Suzuki, M.; Takahashi, Tadayuki; Tashiro, M.; Tueller, J.

doi:10.1007/s11214-005-5096-3

Cited by 1,730 publications

(1,492 citation statements)

References 7 publications

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“…GRB140311A was discovered by the Swift (Gehrels et al 2004) Burst Alert Telescope (BAT, Barthelmy et al 2005) on 2014 March 11 at 21:05:16 UT . The burst duration is T 90 = 71.4±9.5 s, with a fluence of F γ = (2.3±0.3)×10 −6 ergcm 2 (15-150 keV, 90% confidence; Krimm et al 2014).…”

Section: Grb Properties and Observationsmentioning

confidence: 99%

A VLA Study of High-redshift GRBs. I. Multiwavelength Observations and Modeling of GRB 140311A

Laskar

Berger

Chornock

et al. 2018

ApJ

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We present the first results from a recently concluded study of GRBs at z  5 with the Karl G. Jansky Very Large Array (VLA). Spanning 1 to 85.5 GHz and 7 epochs from 1.5 to 82.3 days, our observations of GRB140311A are the most detailed joint radio and millimeter observations of a GRB afterglow at z  5 to date. In conjunction with optical/near-IR and X-ray data, the observations can be understood in the framework of radiation from a single blast wave shock with energy »É 8.5 10 K,iso 53 erg expanding into a constant density environment with density, » n 8 0 -cm 3 . The X-ray and radio observations require a jet break at » t 0.6 jet days, yielding an opening angle of q »  4 jet and a beaming-corrected blast wave kinetic energy of »É 2.2 10 K 50 erg. The results from our radio follow-up and multiwavelength modeling lend credence to the hypothesis that detected high-redshift GRBs may be more tightly beamed than events at lower redshift. We do not find compelling evidence for reverse shock emission, which may be related to fast cooling driven by the moderately high circumburst density.

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Section: Grb Properties and Observationsmentioning

confidence: 99%

A VLA Study of High-redshift GRBs. I. Multiwavelength Observations and Modeling of GRB 140311A

Laskar

Berger

Chornock

et al. 2018

ApJ

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“…The source is classified as a non-detection by the Burst Alert Telescope (BAT; Barthelmy et al 2005) sensitive over 14-195 keV using standard analysis adopted for the 70-month all-sky survey ), and we do not consider the BAT data further in this work. We do note, however, that a custom analysis by Koss et al (2013) finds a 4.2σ detection at the position of NGC 7674 with a flux F 14-195 = 9.9 +5.1 −2.4 × 10 −12 erg s −1 cm −2 , consistent with that inferred from our NuSTAR analysis described later.…”

Section: Swiftmentioning

confidence: 99%

The weak Fe fluorescence line and long-term X-ray evolution of the Compton-thick active galactic nucleus in NGC 7674

Gandhi

Annuar

Lansbury

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present NuSTAR X-ray observations of the active galactic nucleus (AGN) in NGC 7674. The source shows a flat X-ray spectrum, suggesting that it is obscured by Compton-thick gas columns. Based upon long-term flux dimming, previous work suggested the alternate possibility that the source is a recently switched-off AGN with the observed X-rays being the lagged echo from the torus. Our high-quality data show the source to be reflection-dominated in hard X-rays, but with a relatively weak neutral Fe Kα emission line (equivalent width [EW] of ≈ 0.4 keV) and a strong Fe XXVI ionised line (EW ≈ 0.2 keV). We construct an updated longterm X-ray light curve of NGC 7674 and find that the observed 2-10 keV flux has remained constant for the past ≈ 20 years, following a high flux state probed by Ginga. Light travel time arguments constrain the minimum radius of the reflector to be ∼ 3.2 pc under the switchedoff AGN scenario, ≈ 30 times larger than the expected dust sublimation radius, rendering this possibility unlikely. A patchy Compton-thick AGN (CTAGN) solution is plausible, requiring a minimum line-of-sight column density (N H ) of 3 × 10 24 cm −2 at present, and yields an intrinsic 2-10 keV luminosity of (3-5) × 10 43 erg s −1 . Realistic uncertainties span the range of ≈ (1-13) × 10 43 erg s −1 . The source has one of the weakest fluorescence lines amongst bona fide CTAGN, and is potentially a local analogue of bolometrically luminous systems showing complex neutral and ionised Fe emission. It exemplifies the difficulty of identification and proper characterisation of distant CTAGN based on the strength of the neutral Fe Kα line.

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“…The high-energy source Swift J1656.3−3302 was discovered with the BAT imager (Barthelmy et al 2005) onboard the Swift satellite (Gehrels et al 2004) during a survey performed between December 2004 and September 2005 (Okajima et al 2006). The object was detected at coordinates RA = 16 h 56 m 19. s 2, Dec = −33 • 01 48 (J2000), which are about 6 .…”

Section: Previous Information On Swift J16563-3302mentioning

confidence: 99%

High-redshift blazar identification for Swift J1656.3-3302

Masetti

Mason

Landi

et al. 2008

A&A

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We report on the high-redshift blazar identification of a new gamma-ray source, Swift J1656.3−3302, detected with the BAT imager onboard the Swift satellite and the IBIS instrument on the INTEGRAL satellite. Follow-up optical spectroscopy has allowed us to identify the counterpart as an R ∼ 19 mag source that shows broad Lyman-α, Si iv, He ii, C iv, and C iii] emission lines at redshift z = 2.40 ± 0.01. Spectral evolution is observed in X-rays when the INTEGRAL/IBIS data are compared to the Swift/BAT results, with the spectrum steepening when the source gets fainter. The 0.7-200 keV X-ray continuum, observed with Swift/XRT and INTEGRAL/IBIS, shows the power law shape typical of radio loud (broad emission line) active galactic nuclei (with a photon index Γ ∼ 1.6) and a hint of spectral curvature below ∼2 keV, possibly due to intrinsic absorption (N H ∼ 7× 10 22 cm −2 ) local to the source. Alternatively, a slope change (∆Γ ∼ 1) around 2.7 keV can describe the X-ray spectrum equally well. At this redshift, the observed 20-100 keV luminosity of the source is ∼10 48 erg s −1 (assuming isotropic emission), making Swift J1656.3−3302 one of the most X-ray luminous blazars. This source is yet another example of a distant gamma-ray loud quasar discovered above 20 keV. It is also the farthest object, among the previously unidentified INTEGRAL sources, whose nature has been determined a posteriori through optical spectroscopy.

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The Burst Alert Telescope (BAT) on the SWIFT Midex Mission

Cited by 1,730 publications

References 7 publications

A VLA Study of High-redshift GRBs. I. Multiwavelength Observations and Modeling of GRB 140311A

A VLA Study of High-redshift GRBs. I. Multiwavelength Observations and Modeling of GRB 140311A

The weak Fe fluorescence line and long-term X-ray evolution of the Compton-thick active galactic nucleus in NGC 7674

High-redshift blazar identification for Swift J1656.3-3302

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