hi,

IIST offers MASTER OF SCIENCE PROGRAMME in  Astronomy and Astrophysics, this is the only M.sc course comes under post graduate course of IIST. the eligibility criteria is as follows:

B. Tech in Physical Science, B. Tech in Engineering Physics, Master of Science / M.Sc. in Physics, Space Physics, Space Science, Space Science and Technology.

OR

B.E/B.Tech in any area with minimum 3 years work experience in Astronomy & Astrophysics or related areas.

however admission notifications is yet to out for 2021.

keep an eye on official website to know in details.

hope it would help.