Network synthesis localization of two soft gamma repeaters

Hurley, K.; Sommer, M.; Kouveliotou, C.; Fishman, G. J.; Meegan, C.; Cline, T.; Boer, Michiel de; Niel, M.

doi:10.1086/187465

Cited by 37 publications

(28 citation statements)

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“…A folded light curve is shown in Figure 3. This period agrees well with that found for the SGR in outburst on 1998 August 27 (Hurley et al 1998c), making the identification of the quiescent source and the SGR quite secure.…”

Section: Introductionsupporting

confidence: 86%

“…This estimate makes no correction for the sky exposure as a function of Galactic latitude and encompasses the widely varying sensitivities of the ROSAT-pointed observations in the public domain (the typical observation times are 5000-30,000 s). However, as we show here, due to the fact that the period of the quiescent source is identical to that found in the giant flare of 1998 August 27 (Hurley et al 1998c), the association between the SGR and the X-ray source does not depend strongly on this probability. Barat et al 1979. e The source was detected by the ROSAT HRI but not resolved by ASCA; no spectral measurement is available.…”

Section: Introductionsupporting

confidence: 62%

“…SGR 1900ϩ14 lies close to G42.8ϩ0.6 Hurley et al 1999). Three of the four are quiescent soft X-ray point sources: SGR 0525Ϫ66 (Rothschild, Kulkarni, & Lingenfelter 1994), SGR 1806Ϫ20 (Murakami et al 1994), and SGR 1900ϩ14 (Hurley et al 1994(Hurley et al , 1999. Finally, two of the SGRs, 0525Ϫ66 (Mazets et al 1979;Barat et al 1979) and 1900ϩ14 (Hurley et al 1998c), display periodicities in their bursting emission, and one, 1806Ϫ20 , displays a periodicity in its quiescent emission; this indicates that they are all neutron stars.…”

Section: Introductionmentioning

confidence: 94%

“…Kouveliotou et al (1994) suggested that SGR 1900ϩ14 might be associated with one of two SNRs, G43.9ϩ1.6 or G42.8ϩ0.6. Both the ROSAT sky survey (Vasisht et al 1994) and a pointed observation at the position of G42.8ϩ0.6 (Hurley et al 1996) indicated that a pointlike quiescent X-ray source was present near this SNR. This source was also associated with one of the two network synthesis error boxes for this SGR (Hurley et al 1994).…”

Section: Introductionmentioning

confidence: 96%

“…Both the ROSAT sky survey (Vasisht et al 1994) and a pointed observation at the position of G42.8ϩ0.6 (Hurley et al 1996) indicated that a pointlike quiescent X-ray source was present near this SNR. This source was also associated with one of the two network synthesis error boxes for this SGR (Hurley et al 1994). No ROSAT source was detected in the second network synthesis error box (Li et al 1997), and the more recent localization for SGR 1900ϩ14 (Hurley et al 1999) indicates that the first error box is indeed the one that contains the SGR and the quiescent X-ray source.…”

Section: Introductionmentioning

confidence: 96%

See 4 more Smart Citations

[ITAL]ASCA[/ITAL] Discovery of an X-Ray Pulsar in the Error Box of SGR 1900+14

Hurley¹,

Li²,

Kouveliotou³

et al. 1999

The Astrophysical Journal

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171

107

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We present a 2-10 keV ASCA observation of the field around the soft gamma repeater SGR 1900ϩ14. One quiescent X-ray source was detected in this observation, and it was in the SGR error box. In 2-10 keV X-rays, its spectrum may be fitted by a power law with index Ϫ2.2, and its unabsorbed flux is ergs cm Ϫ2 Ϫ12 9.6 # 10 s Ϫ1 . We also find a clear 5.16 s period. The properties of the three well-studied soft gamma repeaters are remarkably similar to one another, and they provide evidence that all of them are associated with young, strongly magnetized neutron stars in supernova remnants.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

See 3 more Smart Citations

[ITAL]ASCA[/ITAL] Discovery of an X-Ray Pulsar in the Error Box of SGR 1900+14

Hurley¹,

Li²,

Kouveliotou³

et al. 1999

The Astrophysical Journal

Self Cite

171

107

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Soft gamma-ray repeaters and superstrong magnetic fields

Murakami¹

1999

Astron. Nachr.

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Four Soft Gamma‐ray Repeaters were observed with ASCA, RXTE and BeppoSAX in X‐ray. Two were already identified to a pulsar of 7.47 s and 5.16 s in period. The periods and the period derivatives enable us to estimate magnetic dipole moments. These are extremely strong of almost 1015 Gauss. Shortage of the rotational energy to explain the observed luminosities and the SGR activities are naturally explained by the Magnetar model by Thompson and Duncun. A possibility to explain the classical GRBs by a giant energy release at the birth of magnetars is also mentioned.

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Testing pulse density distribution for terrestrial gamma ray flashes

2014

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Maximum likelihood fits for the time profiles of 51 terrestrial gamma ray flashes (from Compton Gamma Ray Observatory/Burst and Transient Source Experiment and Fermi Gamma-Ray Space Telescope/Gamma-Ray Burst Monitor) were calculated for five proposed probability densities. A lognormal distribution, which had been used by other researchers, was compared with piecewise Gaussian, piecewise exponential, inverse Gaussian, and Ornstein-Uhlenbeck probability density functions. The piecewise Gaussian and piecewise exponential distributions are justified physically through assuming exponential growth and decay of the electron avalanches which result in the gamma ray bursts and are therefore highly relevant in this context. However, identifying the electron avalanche phenomenon as a form of stochastic exit time process, the inverse Gaussian and Ornstein-Uhlenbeck are reasonable alternatives. Results of the maximum likelihood calculations indicate that the five probability densities fit the gamma ray pulse data equally well. By this comparison, our aim is to indicate to terrestrial gamma ray flash researchers these other at least equally valid distribution functions, which may give insights into the physical processes that the electrons (and the positrons) undergo in the gamma ray flashes.

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Network synthesis localization of two soft gamma repeaters

Cited by 37 publications

References 0 publications

[ITAL]ASCA[/ITAL] Discovery of an X-Ray Pulsar in the Error Box of SGR 1900+14

[ITAL]ASCA[/ITAL] Discovery of an X-Ray Pulsar in the Error Box of SGR 1900+14

Soft gamma-ray repeaters and superstrong magnetic fields

Testing pulse density distribution for terrestrial gamma ray flashes

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