RHESSI search for polarization in prompt GRB emission

Details RHESSI search for polarization in prompt GRB emission RHESSI search for polarization in prompt GRB emission

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.1618c&link_type=abstract

American Astronomical Society, HEAD meeting #7, #16.18; Bulletin of the American Astronomical Society, Vol. 35, p.623

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe efforts to search for linear polarization in Gamma-Ray Bursts (GRBs) using the 9 coaxial germanium focal plane detectors on the Ramaty High Energy Solar Spectroscopic Imager (RHESSI). These detectors are unshielded, so while RHESSI will likely never see a GRB in its 1-degree imaging FOV, it frequently measures GRBs in the detectors from off axis. The instrument provides high resolution spectra and individual photon times, as well as the detector-to-detector scatter events that allow potential polarization measurements. RHESSI has several advantages over previous instruments that have been used to search for GRB polarization, including the fact the RHESSI rotates with a 4 second period, which averages out systematic uncertainties. We will discuss analysis techniques and expected sensitivities, as well as implications of polarization measurements.

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