Early In-orbit Performance of Scanning Sky Monitor Onboard AstroSat
M. C. Ramadevi B. T. Ravishankar N. Sitaramamurthy G. Meena Brajpal Singh Anand Jain Reena Yadav Anil Agarwal V. Chandra Babu Kumar Ankur Kushwaha S. Vaishali Nirmal Kumar Iyer Anuj Nandi Girish V. Vivek Kumar Agarwal S. Seetha Dipankar Bhattacharya K. Balaji Manoj Kumar Prashanth Kulshresta
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’ × 2.5∘ 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.
M. C. Ramadevi1 B. T. Ravishankar1 N. Sitaramamurthy1 G. Meena1 Brajpal Singh1 Anand Jain1 Reena Yadav1 Anil Agarwal1 V. Chandra Babu1 Kumar1 Ankur Kushwaha1 S. Vaishali1 Nirmal Kumar Iyer1 Anuj Nandi1 Girish V.1 Vivek Kumar Agarwal1 S. Seetha2 Dipankar Bhattacharya3 K. Balaji1 Manoj Kumar1 Prashanth Kulshresta1
Volume 43, 2022
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