Polarisation studies of the prompt gamma-ray emission from GRB 041219a using the spectrometer aboard INTEGRAL
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منابع مشابه
Polarisation studies of the prompt gamma-ray emission from GRB 041219a using the Spectrometer aboard INTEGRAL
Linear polarisation in gamma-ray burst prompt emission is an important diagnostic with the potential to significantly constrain models. The spectrometer aboard INTEGRAL, SPI, has the capability to detect the signature of polarised emission from a bright γ–ray source. GRB 041219a is the most intense burst localised by INTEGRAL with a fluence of 5.7 ×10−4 ergs cm−2 over the energy range 20 keV–8 ...
متن کاملSEARCH FOR POLARIZATION FROM THE PROMPT GAMMA-RAY EMISSION OF GRB 041219a WITH SPI ON INTEGRAL
Measuring the polarization of the prompt -ray emission from gamma-ray bursts (GRBs) can significantly improve our understanding of both the GRB emission mechanisms as well as the underlying engine driving the explosion. We searched for polarization in the prompt -ray emission of GRB 041219a with the SPI instrument on INTEGRAL. Using multiple-detector coincidence events in the 100–350 keVenergy ...
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Polarization measurements provide direct insight into the nature of astrophysical processes. Unfortunately, only a few instruments are available for this kind of measurements at γ-ray energies, and the sources need to be very bright. Gamma-Ray Bursts (GRBs) are ideal candidates due to their large flux over limited time intervals, maximizing the available signal-to-noise ratio. To date a few pol...
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Context. GRB 041219a is the brightest burst localised by INTEGRAL. The peak flux of 43 ph cm−2 s−1 (1.84 ×10−5 ergs cm−2 s−1, 20 keV– 8 MeV, 1 s integration) is greater than that for ∼98% of all bursts and the T90 duration of ∼186 s (∼20 keV–8 MeV) is longer than all but a small number of bursts. The intense burst occurred about ∼250 s after the precursor and the long delay enabled optical and ...
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Recent observations show that some or possibly all long-duration gamma-ray bursts (GRBs) arise from the core collapse of massive stars. In this case, the GRB environments are believed to be preburst stellar winds. We here study prompt neutrino emission from reverse shocks as a result of the interaction of relativistic fireballs with their surrounding wind matter. We find that for reasonable par...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20066179