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  • Astrophysics; Space Radiation  (1)
  • Chemistry  (1)
  • GRBs  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 231 (1995), S. 263-270 
    ISSN: 1572-946X
    Keywords: GRBs ; counterparts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The present status of the search for counterparts of gamma-ray bursts is given. Particular emphasis will be put on the search for flaring counterparts, i.e. emission during or shortly after the gamma-ray emission. In view of a separate review on optical counterparts I will concentrate on GeV/TeV, X-ray, radio and neutrino searches.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In this paper results obtained in the conformational analysis of ethers, sulphides, selenoethers, amines, arsine, germanes and stannanes such as R—X—CH2—CH2—Y are given. The AA′BB′ part (-CH2—CH2-) of the NMR spectra was studied by a method using chemical shifts. The electronegativity of the heteroatom was connected with the difference of the chemical shifts of AA′BB′. Following this, conformational analysis based on NMR spectra obtained at different temperatures permitted us to show that in the temperature range used (230 K-320 K) triphenylstannyl-3 propionitrile has a ‘blocked structure’.
    Notes: Dans ce travail, nous présentons les résultats obtenus dans l'analyse conformationnelle d'ethers, de sulfures, de sélénoéthers, d'amines, d'arsine, de germanes et de stannanes du type R—X—CH2—CH2—Y. La partie AA′BB′ (-CH2—CH2-) des spectres a été analysée par une méthode basée sur les déplacements chimiques. Nous avons pu d'abord relier l'électronégativité de l'hétéroatome à la différence des déplacements chimiques des protons AA′BB′. Ensuite, une analyse conformationnelle par variation de température nous a permis de montrer que, dans le domaine étudié (230 K à 320 K), le triphénylstannyl-3 propionitrile possède une structure ‘bloquée’.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2019-07-19
    Description: In the first two years of science operations of the Fermi Gamma-ray Burst Monitor (GBM), August 2008 to August 2010, an approximately 7% (70 mcrab) decline was discovered in the overall Crab nebula flux in the 15 - 50 keV band, measured with the Earth occultation technique. This decline was independently confirmed with four other instruments: the RXTE/PCA, Swift/BAT, INTEGRAL/IBIS, and INTEGRAL/SPI. The pulsed flux measured with RXTE/PCA from 1999-2010 was consistent with the pulsar spin-down, indicating that the observed changes were nebular. From 2001 to 2010, the Crab nebula flux measured with RXTE/PCA was particularly variable, changing by up to approximately 3.5% per year in the 15-50 keV band. These variations were confirmed with INTEGRAL/SPI starting in 2003, Swift/BAT starting in 2005, and Fermi GBM starting in 2008. Before 2001 and since 2010, the Crab nebula flux has appeared more stable, varying by less than 2% per year. At higher energies, above 50 keV, the Crab flux appears to be slowly recovering to its 2008 levels. I will present updated light curves in multiple energy bands for the Crab nebula, including recent data from Fermi GBM, Swift/BAT, INTEGRAL, MAXI, and NuSTAR and a 16-year long light curve from RXTE/PCA.
    Keywords: Astrophysics; Space Radiation
    Type: M14-3745 , INTEGRAL Workshop; Sep 15, 2014 - Sep 19, 2014; Annapolis, MD; United States
    Format: application/pdf
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