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GRIPS: GRB Investigation via Polarimetry and Spectroscopy
The primary scientific goal is the understanding of the origin and physics of gamma-ray bursts (GRB) by performing spectroscopy (200 keV – 50 MeV) and polarimetry (100-1000 keV) at unprecedented sensitivity. Through nuclear resonance absorption lines, the redshift of the GRBs can be derived directly from the ?-ray spectrum, thus allowing to identify GRBs at redshifts beyond z~15 which is the limit for ground-based observations.
Identifying and localizing GRBs at these high redshifts will provide otherwise unaccessible information on the epoch of the formation of the first star(s) and of structure formation. With its large field of view, GRIPS will be a powerful all-sky observatory, with secondary science in nuclear astrophysics and relativistic particle acceleration physics.
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Gamma-Ray Bursts in the GRIPS Era
Gamma-Ray Bursts (GRBs) are very short and intense pulses of gamma-rays. They last from from a few milliseconds to a few hundred seconds. They arrive from random directions in the sky and they appear approximately once per day. In gamma-rays, GRBs are the most luminous sources that are observed. The total energy emitted during the burst (assuming spherical explosion) has been estimated to be of the order of ~1049 - 1051 ergs. To emit such amount of energy our Sun would have to shine from one bilion to 100 billions of years!
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All articles in: Scientific Goals.
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