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Description
This study reports the localization performance and detection efficiency analysis of a compact GRB monitor to fly on a future CubeSat. Our current study involves four model concepts of the instrument. Among them, two consist of four hexagonal CsI(Tl) scintillator detectors of geometric area 12.5 cm$^2$, read out by silicon photomultipliers (SiPM), encased in aluminum of 2-mm thickness on the sides, named Model-1 and Model-2, respectively, with Model-1 having one extra square detector of area 8 cm$^2$ on the top. It is to study the performance improvement due to addition of the top detector. Similarly, the other two models have five and four square CsI(Tl) detectors of geometric area 23 cm$^2$ each and they are named Model-3 and Model-4. All detectors have a thickness of 0.8 cm. The base of each instrument has a 3-mm-thick tungsten layer to protect the SiPM from radiation damage. We run simulations with MEGAlib to study the detection efficiency and localization capability of such an instrument and how much the performance can be improved due to the presence of a 5th detector unit. We demonstrate the localization capability of such a 1U-class instrument. Among the four models, the heaviest one, Model-3, can localize a bright GRB (fluence level $7\times 10^{-5} \, \rm {ergs/cm^{2}}$) with a 3$\sigma$ spread of $10^\circ$. When operated in a CubeSat constellation, the arrival time difference method can be employed to further refine the localization.
| Participate the oral/poster presentation award competition | Yes |
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