The Pioneer Venus Orbiter Gamma Burst Detector

Klebesadel, R. W.; Evans, W. D.; Glore, J. P.; Spalding, R. E.; Wymer, F. J.

doi:10.1109/tgrs.1980.350285

Cited by 13 publications

(6 citation statements)

References 5 publications

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“…A considerable number of other events are yet to be described in print by this consortium; these were observed either with fewer spacecraft and/or with less precision. Full descriptions of the instruments have been published (see, e.g., Anderson et dl., 1978;Barat et al, 1981;Cline et al, 1979;Evans et al, 1979;Klebesadel et al, 1980) and need no elaboration here. The Venera-11 and -12 and Proynoz-7 instruments are Franco-Soviet collaborations on Soviet spacecraft.…”

Section: Instrumentationmentioning

confidence: 90%

Three precise gamma-ray burst source locations

Cline

Desai²,

Teegarden

et al. 1984

ApJ

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The precise source regions of three moderately intense gamma ray bursts are derived. These events were observed with the first interplanetary burst sensor network on 1978 November 24 and 1979 November 5 and 16. The optimum locations of the detectors, widely separated throughout the inner solar system," allowed for high-accuracy, over-determined source fields of size 0.7 to 7. arc-min . All three locations are at fairly high galactic latitude in regions of low source confusion; none can be identified with a steady source object. A search in archived photographs for transients that can be associated with these source fields, however, produced one of the two optical flash events described in the companion Letter (Schaefer et al., 1984). These provide the first confirmation of the gamma-ray burst/optical transient association discovered by .

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Section: Instrumentationmentioning

confidence: 90%

Three precise gamma-ray burst source locations

Cline

Desai²,

Teegarden

et al. 1984

ApJ

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“…Finally, the dates and times of the candidate radio transients can be checked against known gammaray burst (GRB) catalogues. There are no reported GRBs coincident with RT 850630, although at the time the only operational gamma-ray detector was the Pioneer Venus Orbiter (Klebesadel et al 1980;Evans et al 1981). GRB 910627 occurred at UT 04:29:23 on 1991 Jun 27, about twenty minutes before RT 910627.…”

Section: Counterparts At Other Wavelengthsmentioning

confidence: 99%

Transient Events in Archival Very Large Array Observations of the Galactic Center

Chiti

Chatterjee

Wharton

et al. 2016

ApJ

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The Galactic center has some of the highest stellar densities in the Galaxy and a range of interstellar scattering properties that may aid in the detection of new radio-selected transient events. Here we describe a search for radio transients in the Galactic center using over 200 hours of archival data from the Very Large Array (VLA) at 5 and 8.4 GHz. Every observation of Sgr A* from 1985−2005 has been searched using an automated processing and detection pipeline sensitive to transients with timescales between 30 seconds and five minutes with a typical detection threshold of ∼100 mJy. Eight possible candidates pass tests to filter false-positives from radio-frequency interference, calibration errors, and imaging artifacts. Two events are identified as promising candidates based on the smoothness of their light curves. Despite the high quality of their light curves, these detections remain suspect due to evidence of incomplete subtraction of the complex structure in the Galactic center, and apparent contingency of one detection on reduction routines. Events of this intensity (∼100 mJy) and duration (∼100 s) are not obviously associated with known astrophysical sources, and no counterparts are found in data at other wavelengths. We consider potential sources, including Galactic center pulsars, dwarf stars, sources like GCRT J1745−3009, and bursts from X-ray binaries. None can fully explain the observed transients, suggesting either a new astrophysical source or a subtle imaging artifact. More sensitive multiwavelength studies are necessary to characterize these events which, if real, occur with a rate of 14 +32 −12 hr −1 deg −2 in the Galactic center.

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“…From this time until the launch of the Compton Gamma Ray Observatory (CGRO) in 1991 there were a number of small experiments (e.g. KONUS [4] and the Gamma Burst Detector aboard the Pioneer Venus Orbiter [5]) which observed…”

Section: Experimental Historymentioning

confidence: 99%

A Search for Short Duration Very High Energy Emission from Gamma-Ray Bursts

Noyes¹

2006

AIP Conference Proceedings

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Milagro is a water-Cherenkov detector capable of observing air showers produced by gamma rays with primary energies of approximately 100 GeV and higher. The wide field of view (∼ 2 sr) and high duty cycle (>90%) of Milagro make it ideal for searching for transient emission from gamma-ray bursts (GRBs). The median energy of photons detected by Milagro is a few TeV, but the effective area is still relatively large at a few hundred GeV (∼ 50 m 2 at 100 GeV). This results in a gammaray fluence sensitivity comparable to previous satellite detectors at keV energies.Measurements have been made of GRB spectra up to a few tens of GeV with no sign of a cutoff, however much is still unknown about the nature and existence of this Very High Energy (VHE) component. Additionally, gamma/gamma absorption from infrared background photons or from the optically thick region of the burst source complicate observations of this VHE component. However, many models predict VHE emission from GRBs through mechanisms such as synchrotron self-Compton processes. In the absence of a GRB localization provided by another instrument, the Milagro data is searched independently for VHE emission from GRBs. In 2.3 years of searching for bursts with durations ranging from 250 µ s to 40 s, no significant evidence was observed for VHE emission from GRBs. Models for different GRB parameters (such as redshift and isotropic energy distributions) are used to constrain the VHE spectrum of GRBs.

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The Pioneer Venus Orbiter Gamma Burst Detector

Cited by 13 publications

References 5 publications

Three precise gamma-ray burst source locations

Three precise gamma-ray burst source locations

Transient Events in Archival Very Large Array Observations of the Galactic Center

A Search for Short Duration Very High Energy Emission from Gamma-Ray Bursts

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