Super-agile—The X-ray detector for the gamma-ray mission agile

Costa, E.; Barbanera, L.; Feroci, M.; Frutti, M.; Lapshov, I.; Martino, B. De; Mastropietro, M.; Morelli, E.; Rapisarda, M.; Rubini, A.; Soffitta, P.; Tavani, M.; Mereghetti, S.; Vercellone, S.; Caraveo, P. A.; Perotti, F.; Barbiellini, G.; Budini, G.; Longo, F.; Prest, M.; Vallazza, E.; Morselli, A.; Picozza, P.; Cocco, V.; Pittori, C.; Cocco, G. Di; Labanti, C.

doi:10.1063/1.1434691

Cited by 5 publications

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“…With a weight of just ∼100 kg and the dimensions of a cube with sides of about 60 cm, AGILE is the lightest and most compact instrument for high-energy astrophysics flying today. AGILE combines, for the first time, a silicon-tungsten tracker gamma-ray imager ("GRID", sensitive in the 30 MeV-30 GeV range) [112] with a hard X-ray imager ("SuperAGILE", sensitive in the 18-60 keV energy range) [113] with a large FoV (∼1-2.5 steradians) and optimal angular resolution. AGILE is also equipped with a non-imaging gamma-ray scintillation mini-calorimeter (MCAL) sensitive between 350 keV and 100 MeV and a plastic scintillator anticoincidence system.…”

Section: Agile (2007-ongoing)mentioning

confidence: 99%

Gamma-ray Bursts: 50 Years and Counting!

Vigliano,

Longo

2024

Universe

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Section: Agile (2007-ongoing)mentioning

confidence: 99%

Gamma-ray Bursts: 50 Years and Counting!

Vigliano,

Longo

2024

Universe

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AGILE detection of intense gamma-ray emission from the blazar PKS 1510-089

Pucella¹,

Vittorini²,

D’Ammando

et al. 2008

A&A

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Context. We report the detection by the AGILE (Astro-rivelatore Gamma a Immagini LEggero) satellite of an intense gamma-ray flare from the source AGL J1511-0909, associated with the powerful quasar PKS 1510-089, during ten days of observations from 23 August to 1 September 2007. Aims. During the observation period, the source was in optical decrease following a flaring event monitored by the GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT). The simultaneous gamma-ray, optical, and radio coverage allows us to study the spectral energy distribution and the theoretical models based on the synchrotron and inverse Compton (IC) emission mechanisms. Methods. AGILE observed the source with its two co-aligned imagers, the Gamma-Ray Imaging Detector and the hard X-ray imager Super-AGILE sensitive in the 30 MeV ÷ 50 GeV and 18 ÷ 60 keV bands, respectively. Results. Between 23 and 27 August 2007, AGILE detected gamma-ray emission from PKS 1510-089 when this source was located ∼50• off-axis, with an average flux of (270 ± 65) × 10 −8 photons cm −2 s −1 for photon energy above 100 MeV. In the following period, 28 August−1 September, after a satellite re-pointing, AGILE detected the source at ∼35• off-axis, with an average flux (E > 100 MeV) of (195 ± 30) × 10 −8 photons cm −2 s −1 . No emission was detected by Super-AGILE, with a 3-σ upper limit of 45 mCrab in 200 ks. Conclusions. The spectral energy distribution is modelled with a homogeneous one-zone synchrotron self Compton (SSC) emission plus contributions by external photons: the SSC emission contributes primarily to the X-ray band, whereas the contribution of the IC from the external disc and the broad line region match the hard gamma-ray spectrum observed.

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The Synergy of Gamma-Ray Burst Detectors in the Glast Era

Band¹,

Galassi²,

Palmer³

et al. 2008

AIP Conference Proceedings

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Abstract.Simultaneous observations by the large number of gamma-ray burst detectors operating in the GLAST era will provide the spectra, lightcurves and locations necessary for studying burst physics and testing the putative relations between intrinsic burst properties. The detectors' energy band and the accumulation timescale of their trigger system affect their sensitivity to hard vs. soft and long vs. short bursts. Coordination of the Swift and GLAST observing plans consistent with Swift's other science objectives could increase the rate of GLAST bursts with redshifts.Keywords: gamma-ray burst detectors PACS: Anticipated to be launched in spring, 2008, the Gamma-ray Large Area Space Telescope (GLAST) will join a large number of gamma-ray burst detectors that are already operating in space. The strengths of these different detectors complement each other, both in providing capabilities that are absent in other detectors and in allowing crosscalibration. In this work I compare the different detectors and their capabilities.The Table lists the burst detectors (of which I am aware) that will operate during the first few years of the GLAST mission. Quantitative comparisons between different missions are difficult because of the operational details. For example, the sensitivity usually varies across a detector's field-of-view (FOV), resulting in a burst detection threshold that is not uniform. Because many detectors can provide spectra over a larger energy band than used for the burst triggers, in the Table I provide two energy bands. Burst triggers ultimately compare an increase in the number of detected counts in an energy band AE and accumulation time At to the expected background fluctuations; the burst threshold is derived from the signal-to-noise ratio for a A E -At bin. The burst detection sensitivity is the threshold flux FT (here over the 1-1000 keV band) as a function of the burst spectrum (here over 1 s). Burst spectra can be parameterized by the 'Band' function,[l] characterized by low and high energy spectral indices a and P , and a characteristic energy Ep, the photon energy of the peak of the E~N ( E ) = v fv. The left hand panel of the figure presents FT as a function of Ep, fixing a = -1 /2 and p = -2, for different burst detectors. Note that this figure does not show a detector's sensitivity at a given energy but instead the detector sensitivity to a burst with a given E,,. Here I show the sensitivity for Af = 1, but as I discuss elsewhere, detector triggers operate with a variety of AI values, and differ in their sensitivity to bursts with different durations.[2, 71In many cases we are not interested in whether a detector detects a burst-spectral data may be available regardless of whether the detector triggered-but in the spectra the https://ntrs.nasa.gov/search.jsp?R=20080032508 2018-05-12T14:23:36+00:00Z

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Super-agile—The X-ray detector for the gamma-ray mission agile

Cited by 5 publications

References 0 publications

Gamma-ray Bursts: 50 Years and Counting!

Gamma-ray Bursts: 50 Years and Counting!

AGILE detection of intense gamma-ray emission from the blazar PKS 1510-089

The Synergy of Gamma-Ray Burst Detectors in the Glast Era

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