GALI: a Gamma-ray Burst Localizing Instrument
Roi Rahin, Luca Moleri, Alex Vdovin, Amir Feigenboim, Solomon, Margolin, Shlomit Tarem, Ehud Behar, Max Ghelman, and Alon Osovizky

TL;DR
The paper introduces GALI, a novel gamma-ray detector using scintillator cubes for accurate, wide-field localization of GRBs, suitable for small satellite deployment.
Contribution
It presents a new detector concept leveraging mutual occultation of scintillators for precise GRB localization, scalable for various satellite sizes.
Findings
Prototype achieves a few degrees accuracy with laboratory tests.
Simulations indicate <2° localization accuracy for realistic GRBs.
Design is scalable for small and large satellite missions.
Abstract
The detection of astrophysical Gamma-Ray Bursts (GRBs) has always been intertwined with the challenge of identifying the direction of the source. Accurate angular localization of better than a degree has been achieved to date only with heavy instruments on large satellites, and a limited field of view. The recent discovery of the association of GRBs with neutron star mergers gives new motivation for observing the entire -ray sky at once with high sensitivity and accurate directional capability. We present a novel -ray detector concept, which utilizes the mutual occultation between many small scintillators to reconstruct the GRB direction. We built an instrument with 90 (9\,mm) \csi~scintillator cubes attached to silicon photomultipliers. Our laboratory prototype tested with a 60\,keV source demonstrates an angular accuracy of a few degrees for 25 ph\,cm…
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