GRB study is one of the main goals of the Lomonosov space mission. Multimessenger GRB observation is the only way of progress achievement in their study. The Lomonosov satellite is the first space mission in which the multi-wave length observations of GRBs are realized in real time without necessity of optical instrument re-orientation on GRB monitor trigger. The mission payload includes the GRB monitor BDRG, wide -field optical cameras SHOK and UFFO instrument consisting of X-ray imaging telescope UBAT and UV slewing mirror telescope SMT. Two wide field cameras are placed in such a way that their fields of view (FOV) are overlapped by the GRB monitor detector FOVs. This allows the simultaneous GRB observations in gammas and optics in all-time scale of event evolution including obtaining optical light curves of prompt emission as well as of precursors. The real time data transfer to the GCN for detected GRB is realized as well as operative control of BDRG data on triggers from ground based facilities including neutrino and gravitation wave detectors. The GRB catalogue is presented in this report, also those events, for which information was obtained in different bands, are discussed in details.35th International Cosmic Ray Conference -ICRC2017 10-20 July, 2017 Bexco, Busan, Korea 1 Speaker PoS(ICRC2017)669Results of Multimessenger GRB Observations in the Lomonosov Mission 2 IntroductionMulti-wavelength GRB observation is one of the main goals of the Lomonosov space mission launched on 28.04.2016 to the solar synchronous orbit. The mission payload includes a complex of instruments developed for GRB prompt emission detection in all kinds of radiation [1] [2]. It consists of gamma-ray monitor BDRG, wide field optical cameras SHOK and UFFO instrument consisting of X-ray imaging telescope UBAT and UV slewing mirror telescope SMT. In all of the experiments before Lomonosov mission the pointing of optical and soft x-ray instruments after the trigger produced by gamma-telescope is used for multi-wavelength GRB observations. Several methods are used to provide the observation on early phase of GRB sourсe activity. Fast transfer of the message with GRB coordinates to the ground telescopes on the trigger, produced by space instruments was realized by Fermi/GBM, Swift/BAT and some other experiments [3]. Fast pointing of all instruments after GRB trigger by the rotation of the satellite was realized in Swift mission. The time of the satellite reorientation about several tens of seconds allowed one to study GRB afterglows on early stages [3], but the beginning phase of the GRB could not be observed by this method. The Lomonosov satellite is the first space mission in which the early optical observations of GRBs are realized without optical instrument reorientation on GRB monitor trigger by real time recording of the sequence of images from wide-FOV cameras. The real time GRB data transfer to the ground via GlobalStar modem is also realized in Lomonosov mission. Joint analysis of the satellite data and the data of ground robo...

We developed an X-ray detector using 36 arrays, each consisting of a 64-pixellated yttrium oxyorthosilicate (YSO) scintillation crystal and a 64-channel multi-anode photomultiplier tube. The X-ray detector was designed to detect X-rays with energies lower than 10 keV, primarily with the aim of localizing gamma-ray bursts (GRBs). YSO crystals have no intrinsic background, which is advantageous for increasing low-energy sensitivity. The fabricated detector was integrated into UBAT, the payload of the Ultra-Fast Flash Observatory (UFFO)/Lomonosov for GRB observation. The UFFO was successfully operated in space in a low-Earth orbit. In this paper, we present the responses of the X-ray detector of the UBAT engineering model identical to the flight model, using 241Am and 55Fe radioactive sources and an Amptek X-ray tube. We found that the X-ray detector can measure energies lower than 5 keV. As such, we expect YSO crystals to be good candidates for the X-ray detector materials for future GRB missions.