**ISRO’s XPoSat Satellite Opens Access to Indian Scientists: What You Need to Know**
The Indian Space Research Organisation (ISRO) has announced that its X-ray Polarimeter Satellite (XPoSat) mission is now open for proposals from Indian scientists and researchers. Operating in a near-equatorial orbit at an altitude of 650 km, XPoSat carries two cutting-edge scientific payloads designed to advance X-ray astronomy.
**Observatory Time Reserved for Indian Researchers**
In this first observation cycle, ISRO is reserving 60% of the observatory’s time exclusively for Indian researchers. The proposals will utilize the XSPECT (X-ray Spectroscopy and Timing) payload, capable of providing detailed spectroscopic and timing data within the 0.8–15 keV energy range. Observations are scheduled to take place from January to December 2026, representing a significant opportunity to boost India’s astronomy research community.
**Who Can Apply and How to Submit Proposals**
This opportunity is open to Indian scientists and researchers affiliated with institutions, universities, and colleges across India, working in the field of astronomy. Principal Investigators (PIs) submitting proposals must demonstrate the technical capability to analyze the data if their proposals are accepted.
Proposals should be submitted through the XPoSat Proposal Processing System (XPPS), accessible via the Indian Space Science Data Centre (ISSDC) website. The deadline for submission is November 30, 2025.
**Proposal Review and Support**
All proposals will be evaluated by the XPoSat Time Allocation Committee (XTAC) based on scientific merit and technical feasibility. To assist applicants, ISRO has provided extensive technical documentation, including the XSPECT User Handbook. Additionally, tools like XPoViewer are available to help researchers identify satellite visibility periods for their targets of interest.
This initiative marks an exciting development in India’s space science endeavors, offering researchers unprecedented access to space-based X-ray astronomy instruments. Interested scientists are encouraged to prepare and submit their proposals ahead of the deadline.
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