The readout system and the trigger algorithm implementation for the UFFO Pathfinder

G.W. Na, S. Ahmad, P. Barrillon, Søren Brandt, Carl Budtz-Jørgensen, A.J. Castro-Tirado, P. Chen, Y.J. Choi, P. Connell, S. Dagoret-Campagne, C. Eyles, B. Grossan, M.-H.A. Huang, S. Jeong, A. Jung, J. E. Kim, M. B. Kim, S.-W. Kim, Y. W. Kim, A. S. KrasnovJ. Lee, H. Lim, E. V. Linder, T.-C. Liu, Niels Lund, K. W. Min, J. W. Nam, I. H. Park, M. I. Panasyuk, J. Ripa, V. Reglero, J. M. Rodrigo, G. F. Smoot, J. E. Suh, S. Svertilov, N. Vedenkin, M.-Z. Wang, I. Yashin

Research output: Contribution to journalConference articleResearchpeer-review


Since the launch of the SWIFT, Gamma-Ray Bursts (GRBs) science has been much progressed. Especially supporting many measurements of GRB events and sharing them with other telescopes by the Gamma-ray Coordinate Network (GCN) have resulted the richness of GRB events, however, only a few of GRB events have been measured within a minute after the gamma ray signal. This lack of sub-minute data limits the study for the characteristics of the UV-optical light curve of the short-hard type GRB and the fast-rising GRB. Therefore, we have developed the telescope named the Ultra-Fast Flash Observatory (UFFO) Pathfinder, to take the sub-minute data for the early photons from GRB. The UFFO Pathfinder has a coded-mask X-ray camera to search the GRB location by the UBAT trigger algorithm. To determine the direction of GRB as soon as possible it requires the fast processing. We have ultimately implemented all algorithms in field programmable gate arrays (FPGA) without microprocessor. Although FPGA, when compared with microprocessor, is generally estimated to support the fast processing rather than the complex processing, we have developed the implementation to overcome the disadvantage and to maximize the advantage. That is to measure the location as accurate as possible and to determine the location within the sub-second timescale. In the particular case for a accuracy of the X-ray trigger, it requires special information from the satellite based on the UFFO central control system. We present the implementation of the UBAT trigger algorithm as well as the readout system of the UFFO Pathfinder
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Issue numberPART 2
Pages (from-to)84432T
Number of pages10
Publication statusPublished - 2012
EventSpace Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray - Amsterdam RAI Convention Ctr., Amsterdam, Netherlands
Duration: 1 Jul 20126 Jul 2012
Conference number: 8443


ConferenceSpace Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
LocationAmsterdam RAI Convention Ctr.


  • Ultra-fast flash observatory (UFFO)
  • Gamma-ray bursts
  • Trigger algorithm
  • Imaging
  • Data acquisition
  • Readout system
  • Field programmable get arrays


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