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ON CONTRACTION OF ALGEBRAIC POINTS
Bogomolov, Fedor,Qian, Jin Korean Mathematical Society 2017 대한수학회보 Vol.54 No.5
We study contraction of points on ${\mathbb{P}}^1({\bar{\mathbb{Q}}})$ with certain control on local ramification indices, with application to the unramified curve correspondence problem initiated by Bogomolov and Tschinkel.
On contraction of algebraic points
Fedor Bogomolov,Jin Qian 대한수학회 2017 대한수학회보 Vol.54 No.5
We study contraction of points on $\mathbb{P}^1(\bar{\mathbb{Q}})$ with certain control on local ramification indices, with application to the unramified curve correspondence problem initiated by Bogomolov and Tschinkel.
Prompt and Follow-up Multi-wavelength Observations of the GRB 161017A
Sadovnichy, V. A.,Panasyuk, M. I.,Svertilov, S. I.,Lipunov, V. M.,Bogomolov, V. V.,Gorbovskoy, E. S.,Bogomolov, A. V.,Castro-Tirado, A. J.,Gabovich, A.,Hu, Y.,Iyudin, A. F.,Jeong, H. M.,Jeong, S.,Kim, American Astronomical Society 2018 The Astrophysical journal Vol.861 No.1
<P>This paper presents data on the simultaneous and complementary observations of the gamma-ray burst (GRB) GRB 161017A for optical, X-ray, and gamma wavelengths obtained by the Russian multi-messenger Lomonosov space observatory and supplemented by additional data from the Swift satellite as well as the ground-based MASTER Global Robotic Net and the 10 m Gran Telescopio Canarias. Multifrequency spectra of this very powerful explosion indicate that it originated at a distance of 10 billion light years from Earth. Here, we present the results of the prompt, early, and afterglow optical observations. The light curves and spectra suggest that the prompt optical and high-energy emissions occur in the same region near the GRB source.</P>
Wide-Field Gamma-Spectrometer BDRG: GRB Monitor On-Board the Lomonosov Mission
Svertilov, S. I.,Panasyuk, M. I.,Bogomolov, V. V.,Amelushkin, A. M.,Barinova, V. O.,Galkin, V. I.,Iyudin, A. F.,Kuznetsova, E. A.,Prokhorov, A. V.,Petrov, V. L.,Rozhkov, G. V.,Yashin, I. V.,Gorbovskoy D. Reidel Pub. Co 2018 Space science reviews Vol.214 No.1
“Lomonosov” Satellite—Space Observatory to Study Extreme Phenomena in Space
Sadovnichii, V. A.,Panasyuk, M. I.,Amelyushkin, A. M.,Bogomolov, V. V.,Benghin, V. V.,Garipov, G. K.,Kalegaev, V. V.,Klimov, P. A.,Khrenov, B. A.,Petrov, V. L. Springer Science + Business Media 2017 Space science reviews Vol.212 No.3
<P>This paper is directed towards the general description of both scientific goals of the project and scientific equipment on board the satellite. The following papers of this issue are devoted to detailed descriptions of scientific instruments.</P>
UFFO/Lomonosov: The Payload for the Observation of Early Photons from Gamma Ray Bursts
Park, I. H.,Panasyuk, M. I.,Reglero, V.,Chen, P.,Castro-Tirado, A. J.,Jeong, S.,Bogomolov, V.,Brandt, S.,Budtz-Jørgensen, C.,Chang, S.-H.,Chang, Y. Y.,Chen, C.-R.,Chen, C.-W.,Choi, H. S.,Connell, P.,E Springer-Verlag 2018 Space science reviews Vol.214 No.1
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>