In-orbit Performance of UVIT on ASTROSAT
Annapurni Subramaniam, Shyam N. Tandon, John Hutchings, Swarna K., Ghosh, Koshy George, V. Girish, P.U. Kamath, S. Kathiravan, Amit Kumar, J., Paul Lancelot, P.K. Mahesh, Rekhesh Mohan, Jayant Murthy, S. Nagabhushana,, Ashok K. Pati, Joe Postma, N. Kameswara Rao, Kasiviswanathan

TL;DR
This paper reports on the in-orbit performance, calibration, and initial results of the UVIT instrument on ASTROSAT, demonstrating its imaging capabilities, resolution, and sensitivity in the ultraviolet spectrum.
Contribution
First in-orbit calibration and performance verification of UVIT on ASTROSAT, establishing its imaging resolution, sensitivity, and operational stability for UV astronomy.
Findings
UVIT achieved 1.4-1.7 arcsec resolution in UV channels.
Sensitivity was calibrated and found to be within 15% of ground calibration.
UVIT is ready for scientific observations and variability studies.
Abstract
We present the in-orbit performance and the first results from the ultra-violet Imaging telescope (UVIT) on ASTROSAT. UVIT consists of two identical 38cm coaligned telescopes, one for the FUV channel (130-180nm) and the other for the NUV (200-300nm) and VIS (320-550nm) channels, with a field of view of 28 . The FUV and the NUV detectors are operated in the high gain photon counting mode whereas the VIS detector is operated in the low gain integration mode. The FUV and NUV channels have filters and gratings, whereas the VIS channel has filters. The ASTROSAT was launched on 28th September 2015. The performance verification of UVIT was carried out after the opening of the UVIT doors on 30th November 2015, till the end of March 2016 within the allotted time of 50 days for calibration. All the on-board systems were found to be working satisfactorily. During the PV phase, the UVIT…
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