NDLI: Search for Polarization from the Prompt Gamma-ray Emissionof Grb 041219 a with Spi on Integral

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Search for Polarization from the Prompt Gamma-ray Emissionof Grb 041219 a with Spi on Integral

Content Provider	Semantic Scholar
Author	Alemci, E. K. Oggs, S. E. B. Ouveliotou, C. K. Inger, Maayan Aring, M. G. B.
Copyright Year	2006
Abstract	Measuring the polarization of the prompt γ-ray emission from GRBs can significantly improve our understanding of both the GRB emission mechanisms, as well as the u nd rlying engine driving the explosion. We searched for polarization in the prompt γ-ray emission of GRB 041219a with the SPI instrument on INTEGRAL. Using multiple-detector coincidence events in the 100–35 keV energy band, our analysis yields a polarization fraction from this GRB of 98 ± 33%. Statistically, we cannot claim a polarization detecti on from this source. Moreover, different event selection criteria lead to even less significant polarization fractions, e.g. lower polarization fractions are obtained when higher ener gies are included in the analysis. We cannot strongly rule out the possibility that the measured modulation is dom inated by instrumental systematics. Therefore, SPI observations of GRB 041219a do not significantly constra in GRB models. However, this measurement demonstrates the capability of SPI to measure polarization , and the techniques developed for this analysis. Subject headings: polarization, instrumentation: polarimeters, methods: d ata analysis, techniques: polarimetric, gamma rays: bursts, gamma rays: observations
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://research.sabanciuniv.edu/6424/1/ek_polarization.pdf
Alternate Webpage(s)	http://arxiv.org/pdf/astro-ph/0610771v1.pdf
Language	English
Access Restriction	Open
Subject Keyword	Classification Detectors Electronic band structure GZMB wt Allele Gamma correction Instrument - device Kiloelectronvolt Lindane Medical Subject Headings Modulation Polarimetry Polarization (waves) Radiation
Content Type	Text
Resource Type	Article

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