Early In-orbit Performance of Scanning Sky Monitor Onboard AstroSat
We report the in-orbit performance of Scanning Sky Monitor (SSM) onboard AstroSat. The SSM operates in the energy range 2.5 to 10 keV and scans the sky to detect and locate transient X-ray sources. This information of any interesting phenomenon in the X-ray sky as observed by SSM is provided to the astronomical community for follow-up observations. Following the launch of AstroSat on 28th September, 2015, SSM was commissioned on October 12th, 2015. The first power ON of the instrument was with the standard X-ray source, Crab in the field-of-view. The first orbit data revealed the basic expected performance of one of the detectors of SSM, SSM1. Following this in the subsequent orbits, the other detectors were also powered ON to find them perform in good health. Quick checks of the data from the first few orbits revealed that the instrument performed with the expected angular resolution of 12’ \(\times \) 2.5\(^\circ \) and effective area in the energy range of interest. This paper discusses the instrument aspects along with few on-board results immediately after power ON.
KeywordsX-ray sky monitor 1D position sensitive proportional counter coded mask AstroSat X-ray transients
- Agrawal, P. C. 2006, A broad spectral band Indian Astronomy satellite AstroSat, Adv. Space Res., 38(12), 2989–2994.Google Scholar
- Balaji, K., Narendra, S., Nagesh, G., Sridharamurthy, V., Bhat, N. C. 2005, Development of mechanisms for AstroSat, in: Proceedings of the 5th National Seminar & Exhibition on Aerospace and Related Mechanisms, ISRO Satellite Centre, Bangalore, November 18–19, ARMS-05-MSA-02, pp. 67–73.Google Scholar
- Balaji, K., Nagesh, G., Nataraju, B. S., Lakshminarayana, B. 2008, Dynamics of payload release mechanism, in: Proceedings of the 6th National Seminar & Exhibition on Aerospace and Related Mechanisms (ARMS2008), Armament Research & Development Establishment (ARDE), Pashan, Pune, March 28–29, ED/P/20, pp. 333–337.Google Scholar
- Bhattacharya, D., Ravishankar, B. T. 2002, Imaging with the scanning sky monitor on AstroSat, BASI, 30, 833–834.Google Scholar
- Ramadevi, M. C., Ravishankar, B. T., Seetha, S. 2011 Position calibration methodology for scanning sky monitor for AstroSat, Exp. Astron., 31 (2–3), 99–114.Google Scholar
- Ramadevi, M. C., Ravishankar, B. T., Nandi, A., Girish, V., Singh, B., Jain, A., Agrawal, V. K., Agarwal, A., Bhattacharya, D., Seetha, S. et al. 2015b, Detection of beta-class variability in Black Hole source GRS 1915+105 by AstroSat Sacnning Sky Monitor, Astronomer’s Telegram ATel #8185.Google Scholar
- Ramadevi, M. C. , Seetha, S., Bhattacharya, D. et al. 2017, Scanning Sky Monitor (SSM) on-board AstroSat, Exp Astron, doi:10.1007/s10686-017-9536-3.
- Ravishankar, B. T., Bhattacharya, D. 2003, Image reconstruction for a continuously rotating coded mask camera, BASI, 31, 491–492.Google Scholar
- Singh, K. P., Tandon, S. N., Agrawal, P. C., Antia, H. M., Manchanda, R. K., Yadav, J. S., Seetha, S., Ramadevi, M. C., Rao, A. R., Bhattacharya, D. et al. 2014, in: AstroSat Mission, Proceedings of SPIE 2014, Vol. 91442T, 9144–100, doi:10.1117/12.2062667.
- Zand, J. in’t 1992, PhD thesis, University of Utrecht, Netherlands.Google Scholar