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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.09918 |
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| _version_ | 1866918265906790400 |
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| author | Chatterjee, Rwitika Vadodariya, Koushal Vatedka, Radhakrishna Agrawal, Vivek Kumar Tyagi, Anurag Jayasurya, Kiran M P., Shyam Prakash V. C, Ramadevi M Sharan, Vaishali |
| author_facet | Chatterjee, Rwitika Vadodariya, Koushal Vatedka, Radhakrishna Agrawal, Vivek Kumar Tyagi, Anurag Jayasurya, Kiran M P., Shyam Prakash V. C, Ramadevi M Sharan, Vaishali |
| contents | XPoSat is India's first X-ray spectro-polarimetry mission, consisting of two co-aligned instruments, a polarimeter (POLIX) and a spectrometer (XSPECT), to study the X-ray emission from celestial sources. Since polarimetry is a photon-hungry technique, the mission is designed to observe sources for long integration times (~ few days to weeks). This provides an unique opportunity, enabling XSPECT to carry out long-term monitoring of sources, and study their spectro-temporal evolution. To ensure that the instrument is able to fulfill its scientific objectives, it was extensively calibrated on-ground. Post launch, these calibrations were validated using on-board observations. Additionally, some aspects of the instrument such as alignment and effective area were also derived and fine-tuned from in-flight data. In this paper, we describe the calibration of XSPECT instrument in detail, including some initial results derived from its data to establish its capabilities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_09918 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | XSPECT on-board XPoSat: Calibration and First Results Chatterjee, Rwitika Vadodariya, Koushal Vatedka, Radhakrishna Agrawal, Vivek Kumar Tyagi, Anurag Jayasurya, Kiran M P., Shyam Prakash V. C, Ramadevi M Sharan, Vaishali Instrumentation and Methods for Astrophysics XPoSat is India's first X-ray spectro-polarimetry mission, consisting of two co-aligned instruments, a polarimeter (POLIX) and a spectrometer (XSPECT), to study the X-ray emission from celestial sources. Since polarimetry is a photon-hungry technique, the mission is designed to observe sources for long integration times (~ few days to weeks). This provides an unique opportunity, enabling XSPECT to carry out long-term monitoring of sources, and study their spectro-temporal evolution. To ensure that the instrument is able to fulfill its scientific objectives, it was extensively calibrated on-ground. Post launch, these calibrations were validated using on-board observations. Additionally, some aspects of the instrument such as alignment and effective area were also derived and fine-tuned from in-flight data. In this paper, we describe the calibration of XSPECT instrument in detail, including some initial results derived from its data to establish its capabilities. |
| title | XSPECT on-board XPoSat: Calibration and First Results |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2506.09918 |