2020/05/01 by Kristin K. Madsen, Madsen, Kristin K., Brian W. Grefenstette +14 · 3 citations
Engineering · Physics and Astronomy · #Adaptive optics and wavefront sensing #CCD and CMOS Imaging Sensors #Calibration and Measurement Techniques #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Instrumentation and Methods for Astrophysics (astro-ph.IM) #astro-ph.HE #astro-ph.IM
paper · pdf · doi:10.48550/arxiv.2005.00569
The paper has been updated for the NuSTARDAS release v. 2.0.0 and CALDB version 20200813
openalex publication_date 2020/05/01 · arxiv created 2020/08/21 · arxiv updated 2020/08/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A rip in the MLI at the exit aperture of OMA, the NuSTAR optic aligned with detector focal plane module FPMA, has resulted in an increased photon flux through OMA that has manifested itself as a low energy excess. Overall, the MLI coverage has decreased by 10%, but there is an additional time-varying component, which occasionally causes the opening to increase by up to 20%. We address the problem with a calibration update, and in this paper, we describe the attributes of the problem, the implications it has on data analysis, and the solution.