We report on an on-going test campaign of more than 5000 Schottky CdTe detectors (4x4x1 mm^3), over a sample of twelve thousands, provided by Acrorad Co., Ltd (Japan). 6400 of these detectors will be used to build the detection plane of the ECLAIRs camera on the Chinese-French gamma-ray burst mission SVOM. These tests are mandatory to fulfill the prime requirement of ECLAIRs to detect gamma-ray burst photons down to 4 keV. The detectors will be operated at -20C under a reverse bias of 600 V. We found that 78% of the detectors already tested could be considered for the flight model. We measured a mean energy resolution of 1.8 keV at 59.6 keV. We investigated the polarization effect first at room temperature and low bias voltage for faster analysis. We found that the spectroscopic degradation in quantum efficiency, gain and energy resolution, starts as soon as the bias is turned on: first slowly and then dramatically after a time t_p which depends on the temperature and the voltage value. Preliminary tests under in-flight conditions (-20C, -600 V) showed that the detectors should remain stable over a timescale larger than a day. We also measured the mean activation energy of 170 Schottky CdTe detectors. We found evidence for two distinct populations of detectors: the main one centered at 0.64 eV, interpreted as due to cadmium vacancies in the crystal, and the second population centered at 0.54 eV, correlated with a lower apparent resistivity (abridged).
Ultra-long Gamma-Ray Bursts (ulGRBs) are Gamma-Ray Bursts (GRBs) with an unusually long emission in X and gamma rays, reaching durations of thousands of seconds. They could form a specific class of high-energy transient events, whose origin is still under discussion. The current sample of known ulGRBs consists of a few tens of events which have been detected so far by the Burst Alert Telescope (BAT) aboard the Neil Gehrels Swift Observatory and some other instruments. The SVOM mission which is scheduled to begin operations after 2021 could help to detect and observe more ulGRBs thanks to its s…
The coded mask of the ECLAIRs telescope onboard the SVOM space mission
Université Paris Cité, CNRS, Astroparticule et Cosmologie(巴黎西岱大学,法国国家科学研究中心,粒子与宇宙学);CEA Paris-Saclay, Institut de Recherche sur les lois Fondamentales de l’Univers(巴黎萨克雷原子能委员会,基础定律研究所);CNES(法国国家空间研究中心)
Université Paris Cité(巴黎西岱大学);CNRS(法国国家科学研究中心);CEA(法国原子能和替代能源委员会);Astroparticule et Cosmologie(粒子天体物理与宇宙学);CEA Paris-Saclay(巴黎萨克雷CEA);Irfu(法国原子能和替代能源研究院);Département d’Astrophysique(天体物理学系);AIM(物质、宇宙与辐射相互作用实验室)
The SVOM mission under development will carry four instruments, and in particular the coded-mask telescope named ECLAIRs, with a large field of view of about 2 sr, operating in the 4-150 keV energy band. The trigger software on board ECLAIRs will search for high-energy transients such as gamma-ray bursts and peculiar behaviour (e.g. strong outbursts) from known X-ray sources, in order to repoint the satellite to perform follow-up observations with the onboard narrow field of view instruments. The image trigger, one of the two algorithms implemented in the software on board ECLAIRs, produces im…
ECLAIRs: the SVOM high-energy transient trigger camera
IRAP, Université de Toulouse/CNRS/CNES(图卢兹大学/法国国家科学研究中心/法国国家空间研究中心 IRAP);CEA Paris-Saclay, Institut de Recherche sur les lois Fondamentales de l’Univers(巴黎-萨克雷原子能委员会基础定律研究所);Université Paris Cité, CNRS, CEA, Astroparticule et Cosmologie(巴黎西岱大学/法国国家科学研究中心/法国原子能和替代能源署 粒子物理与宇宙学);Laboratoire Universe et Particules de Montpellier, CNRS/IN2P3(蒙彼利埃宇宙与粒子实验室/法国国家科学研究中心/法国国家核子和粒子物理研究所);CNES(法国国家空间研究中心)
The GRB joint scientific analysis pipeline of the ECLAIRs and GRM instruments on board SVOM
Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3(蒙彼利埃宇宙与粒子实验室,蒙彼利埃大学,法国国家科学研究中心/法国国家核子和粒子物理研究所);Sorbonne Université, CNRS, UMR 7095, Institut d’Astrophysique de Paris(索邦大学,法国国家科学研究中心,联合研究单位7095,巴黎天体物理学研究所);Institut Universitaire de France(法兰西学院);INAF –Osservatorio Astronomico di Brera(意大利国家天体物理研究所-布雷拉天文台)
The SVOM mission under development will carry various instruments, and in particular the coded-mask telescope ECLAIRs, with a large field of view of about 2 sr, operating in the 4--150 keV energy band, whose goal is to detect high energy transients such as gamma-ray bursts. The trigger software onboard ECLAIRs will search for new hard X-ray sources appearing in the sky, as well as peculiar behaviour (e.g. strong outbursts) from known sources, in order to repoint the satellite to perform follow-up observations with its onboard narrow field of view instruments. The presence of known X-ray source…
The Microchannel X-ray Telescope on board the SVOM mission: in-flight scientific performance
AIM-CEA/DRF/Irfu/Departement d’Astrophysique, CNRS, Universite Paris-Saclay, Universite Paris Cite(天体物理学与核物理研究所,法国国家科学研究中心,巴黎萨克雷大学,巴黎 Cité 大学);Centre National d’Etudes Spatiales, Centre spatial de Toulouse(法国国家空间研究中心,图卢兹航天中心);Space Park Leicester, University of Leicester(莱斯特大学,莱斯特太空公园);College of Science and Engineering, School of Mathematics and Physics, Kanazawa University(金泽大学,理学院,数学与物理系)
SVOM/VT: Overview of data processing and GRB identifications with X-band data
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿交叉科学研究院);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理学院)
CEA Paris-Saclay, Institut de Recherche sur les lois Fondamentales de l’Univers(法国原子能和替代能源委员会巴黎萨克雷中心基础定律研究所);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所粒子天体物理重点实验室);Aix Marseille Université, CNRS, CNES, LAM(艾克斯-马赛大学);IRAP, Université de Toulouse, CNRS, CNES(图卢兹大学);Université Paris Cité, CNRS, CEA, Astroparticule et Cosmologie(巴黎西岱大学);Sorbonne Université, CNRS, UMR 7095, Institut d’Astrophysique de Paris(索邦大学)
Early results from the SVOM Observatory Science program
Université Paris Cité, CNRS, Astroparticule et Cosmologie(巴黎西岱大学);State Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);IRAP, Université de Toulouse, CNRS, CNES(图卢兹大学);CEA Paris-Saclay, IRFU/DAp-AIM(法国原子能和替代能源委员会);Department of Astronomy, University of Science and Technology of China(中国科学技术大学);Observatoire Astronomique de Strasbourg, Université de Strasbourg, CNRS(斯特拉斯堡大学)
EXPO: a quantum leap in fast, wide-band X-ray polarimetry for astrophysics
INAF-IAPS(意大利国家天体物理研究所);IRAP(空间研究与天体物理学研究所);Univ. Leicester(莱斯特大学);KTH Royal Institute of Technology(皇家理工学院);Univ. Tuebingen(蒂宾根大学);INAF-OAB(意大利国家天体物理研究所);IAA-CSIC(天体生物学研究所);Thales-Alenia Space(泰雷兹阿莱尼亚宇航公司);CBK-PAN(波兰科学院中央天文台);GSSI(格兰萨索科学研究所);CTU(捷克理工大学);Univ. Geneve(日内瓦大学);DTU(丹麦技术大学);Max Planck Institute for Extraterrestrial Physics(马克斯·普朗克地外物理研究所);SRON Space Research Organisation Netherlands(荷兰空间研究组织);Univ. Bonn(波恩大学);INFN-LNF(意大利国家核物理研究所);PRL(物理研究实验室);UCL-MSSL(伦敦大学学院穆拉德空间科学实验室);INAF-OAS(意大利国家天体物理研究所);INAF OAPa(意大利国家天体物理研究所);University of Liége(列日大学);Univ. Roma Tre(罗马第三大学)