Publisher's Note: This paper, originally published on 22 August 2024, was replaced with a corrected/revised version on 20 September 2024. If you downloaded the original PDF but are unable to access the revision, please contact SPIE Digital Library Customer Service for assistance.
Chronos is a X-ray observatory concept capable of “hour-level” follow up observations of transient alerts in 2030s’ multi-messenger astronomy, with 0.3–40+ keV wide X-ray band-width and 250–300 nm ultra-violet (UV) coverage. The mission has a good hard X-ray imaging spectroscopy with > 9′ field of view, the soft X-ray imager with > 30′ field of view, and the UV imager with > 7° field of view. Aiming at launch in mid-2030s, the mission is designed to provide wide-band spectroscopy of time dependent high-energy phenomena. The low background and large effective area in the hard X-ray band also make it good at observing diffuse hard X-ray emissions, such as many TeV sources which will be newly found in 2030s.
HiZ-GUNDAM is a future satellite mission whose mission concept was approved by ISAS/JAXA, and it is one of the future satellite candidates of JAXA’s competitive medium-class mission. HiZ-GUNDAM will lead time-domain astronomy in 2030s, and its key sciences are (1) exploration of the early universe with high-redshift gamma-ray bursts, and (2) contribution to the multi-messenger astronomy. Two mission payloads are aboard HiZ-GUNDAM to realize these two scientific issues. The wide field X-ray monitors which consist of Lobster Eye optics array and focal imaging sensor, monitor ~0.5 steradian field of view in 0.5–4 keV energy range. The near infrared telescope with an aperture size of 30 cm in diameter performs simultaneous 5-band photometric observation in 0.5–2.5 μm wavelength with Koester’s prism for X-ray transients discovered by Wide Field X-ray Monitor. In this paper, we introduce the mission overview of HiZ-GUNDAM while the information contained herein may change in future studies.
The KOYOH satellite, launched on December 1, 2023, aboard a SpaceX Falcon 9 rocket from Vandenberg Space Force Base, is a 50-kg class microsatellite designed to advance the understanding of short gamma-ray bursts (GRBs) and their association with gravitational wave (GW) events. The satellite operates in a Sun-Synchronous Orbit (SSO), equipped with the Transient Localization Experiment (T-LEX) and the Gamma-ray Detector (KGD). T-LEX, a wide-field X-ray imaging detector, and KGD, a wide-field gamma-ray detector, are designed to detect and localize GRBs and other high-energy transients. Following its launch and initial deployment, the satellite successfully established communication links and confirmed the operational status of its subsystems. Initial telemetry data verified the deployment of the Solar Array Paddles (SAP) and correct orientation towards the Sun. The satellite’s power systems were confirmed to be functioning nominally. Subsequent tests established the functionality of the mission instruments. The KGD exhibited a count rate of about 300-500 counts/sec at low latitudes, while T-LEX showed a count rate of approximately 200-300 counts/sec in total. These initial results confirm the successful detection of X-ray and gamma-ray photons by both instruments in orbit. This paper details the design, launch, initial operations, and early mission results of the KOYOH satellite, highlighting its contributions to multi-messenger astronomy.
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