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UBAT of UFFO/Lomonosov: The X-Ray Space Telescope to Observe Early Photons from Gamma-Ray Bursts
Jeong, S.,Panasyuk, M. I.,Reglero, V.,Connell, P.,Kim, M. B.,Lee, J.,Rodrigo, J. M.,Ripa, J.,Eyles, C.,Lim, H.,Gaikov, G.,Jeong, H.,Leonov, V.,Chen, P.,Castro-Tirado, A. J.,Nam, J. W.,Svertilov, S.,Ya Springer-Verlag 2018 Space science reviews Vol.214 No.1
THE UFFO SLEWING MIRROR TELESCOPE FOR EARLY OPTICAL OBSERVATION FROM GAMMA RAY BURSTS
NAM, JIWOO,AHMAD, S.,AHN, K.,BARRILLON, P.,BRANDT, S.,BUDTZ-JØRGENSEN, C.,CASTRO-TIRADO, A. J.,CHANG, S.-H.,CHEN, C.-R.,CHEN, P.,CHOI, Y. J.,CONNELL, P.,DAGORET-CAMPAGNE, S.,EYLES, C.,GROSSAN, B.,HUAN World Scientific 2013 Modern physics letters A Vol.28 No.2
<P> While some space born observatories, such as SWIFT and FERMI, have been operating, early observation of optical after grow of GRBs is still remained as an unexplored region. The Ultra-Fast Flash Observatory (UFFO) project is a space observatory for optical follow-ups of GRBs, aiming to explore the first 60 seconds of GRBs optical emission. Using fast moving mirrors to redirect our optical path rather than slewing the entire spacecraft, UFFO is utilized to catch early optical emissions from GRB within 1 sec. We have developed the UFFO Pathfinder Telescope which is going to be on board of the Lomonosov satellite and launched in middle of 2012. We will discuss about scientific potentials of the UFFO project and present the payload development status, especially for Slewing Mirror Telescope which is the key instrument of the UFFO-pathfinder mission. </P>
Chang, Y.-Y.,Chen, C.R.,Chen, P.,Huang, J.-J.,Huang, M.A.,Liu, T.-C.,Nam, J.W.,Wang, M.-Z.,Bogomolov, V.,Brandt, S.,Budtz-Jørgensen, C.,Castro-Tirado, A.J.,Choi, H.S.,Connell, P.H.,Eyles, C.,Jeong, S. Elsevier 2015 Nuclear Instruments & Methods in Physics Research. Vol.771 No.-
<P><B>Abstract</B></P> <P>In this paper we present the Inverted-Conical light guide designed for optical crosstalk reduction in the scintillator-MAPMT assemblies. The research was motivated by the 30% crosstalk observed in <I>UFFO</I> X-ray telescope, <I>UBAT</I>, during the preliminary calibration with MAPMTs of 64 2.88 × 2.88 mm<SUP>2</SUP> pixels and identically gridded YSO crystal matrices. We began the study with the energy and crosstalk calibrations of the detector, then we constructed a GEANT4 simulation with the customized metallic film model as the MAPMT photocathode. The simulation reproduced more than 70% of the crosstalk and explained it as a consequence of the total reflection produced by the photocathode. The result indicated that the crosstalk mechanism could be a common case in most of the contact-assembled scintillation detectors. The concept of the Inverted-Conical light guide was to suppress the total reflection by contracting the incident angle of the scintillation. We optimized the design in the simulation and fabricated a test sample. The test sample reduced 52% crosstalk with a loss of 6% signal yield. The idea of the Inverted-Conical light guide can be adapted by scintillation detectors multi-pixel, imaging-purpose scintillation detectors such as the ultra-fast GRB observatory <I>UFFO-UBAT</I>, whose performances are sensitive to responding time, image resolution, and geometrical modifications.</P>