Experimental Astronomy

, Volume 45, Issue 2, pp 201–218 | Cite as

Wide-field ultraviolet imager for astronomical transient studies

  • Joice MathewEmail author
  • S. Ambily
  • Ajin Prakash
  • Mayuresh Sarpotdar
  • K. Nirmal
  • A. G. Sreejith
  • Margarita Safonova
  • Jayant Murthy
  • Noah Brosch
Original Article


Though the ultraviolet (UV) domain plays a vital role in the studies of astronomical transient events, the UV time-domain sky remains largely unexplored. We have designed a wide-field UV imager that can be flown on a range of available platforms, such as high-altitude balloons, CubeSats, and larger space missions. The major scientific goals are the variability of astronomical sources, detection of transients such as supernovae, novae, tidal disruption events, and characterizing active galactic nuclei variability. The instrument has a 80 mm aperture with a circular field of view of 10.8 degrees, an angular resolution of ∼22 arcsec, and a 240 - 390 nm spectral observation window. The detector for the instrument is a Microchannel Plate (MCP)-based image intensifier with both photon counting and integration capabilities. An FPGA-based detector readout mechanism and real time data processing have been implemented. The imager is designed in such a way that its lightweight and compact nature are well fitted for the CubeSat dimensions. Here we present various design and developmental aspects of this UV wide-field transient explorer.


Ultraviolet space instrumentation Wide-field imager Transient detection Time-domain astronomy 



Part of this research has been supported by the Department of Science and Technology (Government of India) under Grant IR/S2/PU-006/2012. A. G. Sreejith acknowledges Austrian Forschungsförderungsgesellschaft FFG project “ACUTEDIRNDL” P859718.


  1. 1.
    Côté, P.: Adv. Space Res. 53, 982 (2014)ADSCrossRefGoogle Scholar
  2. 2.
    Brosch, N., Balabanov, V., Behar, E.: Astrophys. Space Sci. 354, 205 (2014)ADSCrossRefGoogle Scholar
  3. 3.
    Sagiv, I., Gal-Yam, A., Ofek, E.O., et al.: Astrophys. J. 147, 79 (2014)Google Scholar
  4. 4.
    Cenko, S.B., Krimm, H.A., Horesh, A., et al.: Astrophys. J. 753, 77 (2012)ADSCrossRefGoogle Scholar
  5. 5.
    Botticella, et al.: Astrophys. J. Lett. 717, L52 (2010)ADSCrossRefGoogle Scholar
  6. 6.
    Rabinak, I., Waxman, E.: Astrophys. J. 728, 63 (2011)ADSCrossRefGoogle Scholar
  7. 7.
    Gezari, S., Martin, D.C., Forster, K., et al.: Astrophys. J. 766, 60 (2013)ADSCrossRefGoogle Scholar
  8. 8.
    Martin, D.C., Fanson, J., Schiminovich, D., et al.: Astrophys. J. 619, L1 (2005)ADSCrossRefGoogle Scholar
  9. 9.
    Ganot, N., Gal-Yam, A., Ofek, E.O., et al.: Astrophys. J. 820, 57 (2016)ADSCrossRefGoogle Scholar
  10. 10.
    Welsh, B.Y., Wheatley, J.M., Neil, J.D: Astron. Astrophys. 527, A15 (2011)ADSCrossRefGoogle Scholar
  11. 11.
    Nakar, E., Sari, R.: Astrophys. J. 725, 904 (2010)ADSCrossRefGoogle Scholar
  12. 12.
    Gezari, S., Chornock, R., Rest, A., et al.: Nature 485, 217 (2012)ADSCrossRefGoogle Scholar
  13. 13.
    Mathew, J., Prakash, A., Sarpotdar, M., et al.: Astrophys. Space Sci. 362, 37 (2017)ADSCrossRefGoogle Scholar
  14. 14.
    Ridden-Harper, R., Tucker, B.E., Sharp, R., Gilbert, J., Petkovic, M.: Mon. Not. R. Astron. Soc. 472, 4521 (2017)ADSCrossRefGoogle Scholar
  15. 15.
    Greenbaum, A., Knapp, M., Schaalman, G., Henderson, T., Seager, S.: Proceedings of the 2013 IEEE Aerospace Conference, pp. 73 (2013)Google Scholar
  16. 16.
    Vallerga, J., McPhate, J., Tremsin, A., Siegmund, O.: Astrophys. Space Sci. 320, 247 (2009)ADSCrossRefGoogle Scholar
  17. 17.
    Kumar, A., Ghosh, S.K., Hutchings, J., et al.: Proc. SPIE 8443, 84431N (2012)CrossRefGoogle Scholar
  18. 18.
    Ambily, S., Sarpotdar, M., Mathew, J., et al.: J. Astron. Instrum. 6, 1750002 (2017)CrossRefGoogle Scholar
  19. 19.
    Oke, J.B., Gunn, J.E.: Astrophys. J. 266, 713 (1983)ADSCrossRefGoogle Scholar
  20. 20.
    Rahna, P.T., Murthy, J., Safonova, M., et al.: Mon. Not. R. Astron. Soc. 471, 3028 (2017)ADSCrossRefGoogle Scholar
  21. 21.
    Ariane 5 User’s Manual: Issue 5, Revision 1 (2011)Google Scholar
  22. 22.
    Nirmal, K., Sreejith, A.G., Mathew, J., et al.: J. Astron. Telescopes, Instrum. Syst. 2, 047001 (2016)ADSCrossRefGoogle Scholar
  23. 23.
    Sreejith, A.G., Mathew, J., Sarpotdar, M., et al.: Proceedings of the SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, pp. 99084E (2016)Google Scholar
  24. 24.
    Sarpotdar, M., Mathew, J., Sreejith, A.G.: Exp. Astron. 43, 99 (2017)ADSCrossRefGoogle Scholar
  25. 25.
    Morrissey, P., Conrow, T., Barlow, T., et al.: Astrophys. J. Suppl. 173, 682 (2007)ADSCrossRefGoogle Scholar
  26. 26.
    ULTRASAT: exploring the UV transient sky, 2015, Eran Ofek, the Big Data meeting, CaltechGoogle Scholar
  27. 27.
    Instrument Design for the CubeSat Ultraviolet Transient/Imaging Experiment Project, 2014–2015, NASA TechPort Data Sheet, Center Independent Research & Developments: GSFC IRAD Program, Mission Support Directorate (MSD)Google Scholar
  28. 28.
    Cenko, S.B., Bellm, E.C., Gal-Yam, A., et al.: Amer. Astron. Soc. Meet. Abstract. 229, 328.04 (2017)ADSGoogle Scholar
  29. 29.
    Brosch, N.: Exp. Astron. 9, 119 (1999)ADSCrossRefGoogle Scholar
  30. 30.
    Henry, R.C.: In 10-th Texas Symposium for Relativistic Astrophysics, p 428. Annals of NY Academy of Sciences, New York (1982)Google Scholar
  31. 31.
    Kulkarni, S.R., Rau, A.: Astrophys. J. Lett. 644, L63 (2016)ADSCrossRefGoogle Scholar
  32. 32.
    Safonova, M., Sivaram, C., Murthy, J.: Astrophys. Space Sci. 318, 1 (2008)ADSCrossRefGoogle Scholar
  33. 33.
    Gezari, S., Basa, S., Martin, D.C., et al.: Astrophys. J. 676, 944–969 (2008)ADSCrossRefGoogle Scholar
  34. 34.
    Oh, S., Price-Whelan, A.M., Brewer, J.M., et al.: arXiv:1709.05344 (2017)

Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Indian Institute of AstrophysicsBangaloreIndia
  2. 2.Space Research InstituteAustrian Academy of SciencesGrazAustria
  3. 3.M. P. Birla Institute of Fundamental ResearchBangaloreIndia
  4. 4.The Wise Observatory and the Department Of Physics and AstronomyTel Aviv UniversityTel AvivIsrael

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