The Near Ultraviolet Transient Surveyor (NUTS): An ultraviolet telescope to observe variable sources

Abstract

Observing the ultraviolet (UV) sky for time-variable phenomena is one of the many exciting science goals that can be achieved by a relatively small aperture telescope in space. The Near Ultraviolet Transient Surveyor (NUTS) is a wide-field ($3^{\circ }$) imager with a photon-counting detector in the near-UV (NUV, 200-300 nm), to be flown on an upcoming small satellite mission. It has a Ritchey-Chretien (RC) telescope design with correction optics to enable wide-field observations while minimizing optical aberrations. We have used an intensified CMOS detector with a solar blind photocathode, to be operated in photon-counting mode. The main science goal of the instrument is the observation of transient sources in the UV, including flare stars, supernovae, and active galactic nuclei. NUTS's aperture size and effective area enable observation of relatively unexplored, brighter parts of the UV sky which are usually not accessible to larger missions. We have designed, fabricated, and assembled the instrument, and the final calibrations and environmental tests are being carried out. In this paper, we provide the scientific motivation and technical overview of the instrument and describe the assembly and calibration steps.

12 pages, 9 figures; Accepted for publication in Experimental Astronomy

References in corpus (15)

• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Techniques and Review of Absolute Flux Calibration from the Ultraviolet to the Mid-Infrared
• The Habitable Exoplanet Observatory (HabEx) Mission Concept Study Final Report
• gPhoton: The GALEX Photon Data Archive
• The GALEX Time Domain Survey I. Selection and Classification of Over a Thousand UV Variable Sources
• The detection of M-dwarf UV flare events in the GALEX data archives
• Mapping the Diffuse Ultraviolet Sky with GALEX
• The Second Galex Ultraviolet Variability (GUVV-2) Catalog
• Development of Data Acquisition Methods for an FPGA-Based Photon Counting Detector
• Prospect for UV observations from the Moon. II. Instrumental Design of an Ultraviolet Imager LUCI
• Capability of Detecting Ultra-Violet Counterparts of Gravitational Waves with GLUV
• A generic FPGA-based detector readout and real-time image processing board
• Prospect for UV observations from the Moon
• Balloon UV Experiments for Astronomical and Atmospheric Observations
• Prospect for UV observations from the Moon. III. Assembly and ground calibration of Lunar Ultraviolet Cosmic Imager (LUCI)