How did astronomers use technology to identify characteristics of the crab nebula?

A star remarkably ruptured about 7,500 years ago established about 6,500 light years away. The explosion states that the star was brighter than million suns and it was visible during day light which amazed the Chinese astronomers. There were amazed at the appearance of the bright star. Many years later, the arrival of the telescope, astronomers launch a nebula which is a cloud like structure and that it is a remnant of  a shattered star. The astronomers detected the promptly rotating neutron star - a pulsar surrounded by a gas envelope. Now Indian astronomers, combine powerful Cadmium-Zinc-Telluride imager on the on panel the indian astronomy satellite, AtroSat, have achieved  the most absolute X-ray polarization measurement of the Crab nebula.