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Proceedings Paper

In-orbit performance of UVIT on ASTROSAT
Author(s): 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 Sankarasubramanian; P. Sreekumar; S. Sriram; Chelliah S. Stalin; Firoza Sutaria; Yuvraj Harsha Sreedhar; Indrajit V. Barve; Chayan Mondal; Snehalate Sahu
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Paper 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 arcmin. 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 observed several calibration sources to characterise the instrument and a few objects to demonstrate the capability of the UVIT. The resolution of the UVIT was found to be about 1.4 - 1.7 arcsec in the FUV and NUV. The sensitivity in various filters were calibrated using standard stars (white dwarfs), to estimate the zero-point magnitudes as well as the flux conversion factor. The gratings were also calibrated to estimate their resolution as well as effective area. The sensitivity of the filters were found to be reduced up to 15% with respect to the ground calibrations. The sensitivity variation is monitored on a monthly basis. At the end of the PV phase, the instrument calibration is almost complete and the remaining calibrations will be completed by September 2016. UVIT is all set to roll out science results with its imaging capability with good resolution and large field of view, capability to sample the UV spectral region using different filters and capability to perform variability studies in the UV.

Paper Details

Date Published: 18 July 2016
PDF: 10 pages
Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99051F (18 July 2016); doi: 10.1117/12.2235271
Show Author Affiliations
Annapurni Subramaniam, Indian Institute of Astrophysics (India)
Shyam N. Tandon, Indian Institute of Astrophysics (India)
John Hutchings, National Research Council (Canada)
Swarna K. Ghosh, National Ctr. for Radio Astrophysics (India)
Koshy George, Indian Institute of Astrophysics (India)
V. Girish, ISRO Satellite Ctr. (India)
P. U. Kamath, Indian Institute of Astrophysics (India)
S. Kathiravan, Indian Institute of Astrophysics (India)
Amit Kumar, Indian Institute of Astrophysics (India)
J. Paul Lancelot, Indian Institute of Astrophysics (India)
P. K. Mahesh, Indian Institute of Astrophysics (India)
Rekhesh Mohan, Indian Institute of Astrophysics (India)
Jayant Murthy, Indian Institute of Astrophysics (India)
S. Nagabhushana, Indian Institute of Astrophysics (India)
Ashok K. Pati, Indian Institute of Astrophysics (India)
Joe Postma, Univ. of Calgary (Canada)
N. Kameswara Rao, Indian Institute of Astrophysics (India)
Kasiviswanathan Sankarasubramanian, ISRO Satellite Ctr. (India)
P. Sreekumar, Indian Institute of Astrophysics (India)
S. Sriram, Indian Institute of Astrophysics (India)
Chelliah S. Stalin, Indian Institute of Astrophysics (India)
Firoza Sutaria, Indian Institute of Astrophysics (India)
Yuvraj Harsha Sreedhar, Indian Institute of Astrophysics (India)
Indrajit V. Barve, Indian Institute of Astrophysics (India)
Chayan Mondal, Indian Institute of Astrophysics (India)
Snehalate Sahu, Indian Institute of Astrophysics (India)


Published in SPIE Proceedings Vol. 9905:
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Tadayuki Takahashi; Marshall Bautz, Editor(s)

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