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Vaishali, S.

Scanning Sky Monitor On-Board AstroSat

Abstract Views :258 | PDF Views:90

Authors

M. C. Ramadevi ¹, S. Seetha ², Dipankar Bhattacharya ³, B. T. Ravishankar ¹, N. Sitaramamurthy ¹, G. Meena ¹, M. Ramakrishna Sharma ¹, Ravi Kulkarni ¹, V. Chandra Babu ¹, Kumar ¹, Brajpal Singh ¹, Anand Jain ¹, Reena Yadav ¹, S. Vaishali ¹, B. N. Ashoka ¹, Anil Agarwal ¹, K. Balaji ⁴, Manoj Kumar ⁵, Prashanth Kulshresta ⁵, Pankaj Agarwal ⁶, Mathew Sebastian ⁶

Affiliations
1 Space Astronomy Group, SSIF, ISITE Campus, Karthik Nagar, Outer Ring Road, ISRO Satellite Centre, Bengaluru 560 037, IN
2 Indian Space Research Organisation Headquarters, Department of Space, Antariksh Bhavan, New BEL Road, Bengaluru 560 231, IN
3 Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007, IN
4 Spacecraft Mechanisms Group, ISAC, Old Airport Road, Vimanapura Post, Bengaluru 560 017, IN
5 Control and Digital Electronics Group, ISAC, Old Airport Road, Vimanapura Post, Bengaluru 560 017, IN
6 Vikram Sarabhai Space Center, Thiruvananthapuram 695 022, IN

Source

Current Science, Vol 113, No 04 (2017), Pagination: 599-601

Abstract

Scanning Sky Monitor (SSM) on-board AstroSat is a wide-field imager to monitor the X-ray sky in the energy band 2.5-10 keV. The primary science objective of SSM is to detect and locate transient X-ray sources in the sky. Once detected the information is to be provided to the astronomical community for follow-up observations to do a more detailed study of the source. Long-term monitoring of known X-ray transient sources is also one of the science objectives of SSM. The instrument constitutes three units of 1D positionsensitive propotional counters with coded masks on each, all three mounted on a platform capable of rotation to scan about 50% of the sky in one full rotation. The angular resolution of each unit in SSM is 12' x 2.5°. Sensitivity of SSM is ~30 milliCrab at 3 sigma in 10 min integration time. This article briefly discusses the instrument and a few early results since the launch of AstroSat.

Keywords

AstroSat, Crab, Scanning Sky Monitor, X-Ray Transient Sources.

Full Text

References

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Ramadevi, M. C. et al., Detection of beta-class variability in black hole source GRS 1915+105 by AstroSat Scanning Sky Monitor. The Astronomer’s Telegram ATel #8185, 2015.

Chandrayaan-2 Large Area Soft X-ray Spectrometer

Abstract Views :269 | PDF Views:85

Authors

V. Radhakrishna ¹, A. Tyagi ¹, S. Narendranath ¹, Koushal Vadodariya ¹, Reena Yadav ¹, Brajpal Singh ¹, G. Balaji ¹, Neeraj Satya ¹, Akash Shetty ¹, H. N. Suresha Kumar ¹, Kumar ¹, S. Vaishali ¹, Netra S. Pillai ¹, S. Tadepalli ¹, Venkata Raghavendra ¹, P. Sreekumar ², Anil Agarwal ¹, N. Valarmathi ¹

Affiliations
1 U.R. Rao Satellite Centre, ISRO, Bengaluru 560 017, IN
2 Space Science Programme Office, ISRO Head Quarters, Bengaluru 560 017, IN

Source

Current Science, Vol 118, No 2 (2020), Pagination: 219-225

Abstract

Chandrayaan-2 Large Area Soft X-ray Spectrometer (CLASS) is an X-ray fluorescence spectrometer experiment aimed at mapping the abundances of major rock-forming elements on the lunar surface. The instrument consists of swept charge devices with a passive collimator, visible light blocking filters and signal processing electronics designed and built at U.R. Rao Satellite Centre, Indian Space Research Organisation. CLASS will be the largest collecting area spectrometer flown to the Moon, and thus is expected to map the abundances of lunar elements with a higher sensitivity than ever at soft X-ray energies.

Keywords

Moon, Rock-forming Elements, Spectrometer, X-ray Fluorescence.

Full Text

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