UBAT of UFFO/Lomonosov: The X-Ray Space Telescope to Observe Early Photons from Gamma-Ray Bursts

S. Jeong, M. I. Panasyuk, V. Reglero, P. Connell, M. B. Kim, J. Lee, J. M. Rodrigo, J. Ripa, C. Eyles, H. Lim, G. Gaikov, H. Jeong, V. Leonov, P. Chen, A. J. Castro-Tirado, J. W. Nam, S. Svertilov, I. Yashin, G. Garipov, M. H.A. HuangJ. J. Huang, J. E. Kim, T. C. Liu, V. Petrov, V. Bogomolov, C. Budtz-Jørgensen, S. Brandt, I. H. Park*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

7 Scopus citations


The Ultra-Fast Flash Observatory (UFFO) Burst Alert and Trigger Telescope (UBAT) has been designed and built for the localization of transient X-ray sources such as Gamma Ray Bursts (GRBs). As one of main instruments in the UFFO payload onboard the Lomonosov satellite (hereafter UFFO/Lomonosov), the UBAT’s roles are to monitor the X-ray sky, to rapidly locate and track transient sources, and to trigger the slewing of a UV/optical telescope, namely Slewing Mirror Telescope (SMT). The SMT, a pioneering application of rapid slewing mirror technology has a line of sight parallel to the UBAT, allowing us to measure the early UV/optical GRB counterpart and study the extremely early moments of GRB evolution. To detect X-rays, the UBAT utilizes a 191.1 cm2 scintillation detector composed of Yttrium Oxyorthosilicate (YSO) crystals, Multi-Anode Photomultiplier Tubes (MAPMTs), and associated electronics. To estimate a direction vector of a GRB source in its field of view, it employs the well-known coded aperture mask technique. All functions are written for implementation on a field programmable gate array to enable fast triggering and to run the device’s imaging algorithms. The UFFO/Lomonosov satellite was launched on April 28, 2016, and is now collecting GRB observation data. In this study, we describe the UBAT’s design, fabrication, integration, and performance as a GRB X-ray trigger and localization telescope, both on the ground and in space.

Original languageEnglish
Article number16
JournalSpace Science Reviews
Issue number1
StatePublished - 1 Feb 2018


  • Coded mask
  • Gamma Ray Burst
  • Lomonosov
  • UFFO
  • YSO


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