BASIS: a new gamma-ray burst imaging and spectroscopy mission concept

摘要

Abstract: We have proposed a gamma-ray burst mission conceptcalled burst arcsecond imaging and spectroscopy (BASIS)in response to NASA's announcement for new missionconcept studies. The scientific objectives are toaccurately locate bursts, determine their distancescale, and measure the physical characteristics of theemission region. Arcsecond burst positions (angularresolution approximately 30 arcsec, source positionsapproximately 3 arcsec for greater than 10$+$MIN@6$/erg cm$+$MIN@2$/ bursts) are obtained for about 100bursts per year using the 10 - 200 keV emission. Thisallows the first deep, unconfused counterpart searchesat other wavelengths. The key technologicalbreakthrough that makes such measurements possible isthe development of CdZnTe room-temperaturesemiconductor detectors with fine (approximately 100micron) spatial resolution. Fine spectroscopy isobtained between 0.2 keV and 200 keV. The 0.2 keVthreshold allows the first measurements of absorptionin our galaxy and possible host galaxies, constrainingthe distance scale and host environment. The missionconcept and its scientific objectives are described. !2