AstroSat-CZTI as a hard X-ray Pulsar Monitor. (arXiv:2101.08650v1 [astro-ph.HE])

AstroSat-CZTI as a hard X-ray Pulsar Monitor. (arXiv:2101.08650v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Anusree_K/0/1/0/all/0/1">K.G. Anusree</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Bhattacharya_D/0/1/0/all/0/1">D. Bhattacharya</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Rao_A/0/1/0/all/0/1">A.R. Rao</a> (2 and 5), <a href="http://arxiv.org/find/astro-ph/1/au:+Vadawale_S/0/1/0/all/0/1">S. Vadawale</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Bhalerao_V/0/1/0/all/0/1">V. Bhalerao</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Vibhute_A/0/1/0/all/0/1">A. Vibhute</a> (2) ((1) School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam, India, (2) Inter-University Centre for Astronomy and Astrophysics, Pune, India, (3) Physical Research Laboratory, Ahmedabad, India. (4) Physical Research Laboratory, Ahmedabad, India, (5) Tata Institute of Fundamental Research, Mumbai, India)

The Cadmium Zinc Telluride Imager (CZTI) is an imaging instrument onboard
AstroSat. This instrument operates as a nearly open all-sky detector above ~60
keV, making possible long integrations irrespective of the spacecraft pointing.
We present a technique based on the AstroSat-CZTI data to explore the hard
X-ray characteristics of the $gamma$-ray pulsar population. We report highly
significant ($sim 30sigma$) detection of hard X-ray (60–380 keV) pulse
profile of the Crab pulsar using $sim$5000 ks of CZTI observations within 5 to
70 degrees of Crab position in the sky, using a custom algorithm developed by
us. Using Crab as our test source, we estimate the off-axis sensitivity of the
instrument and establish AstroSat-CZTI as a prospective tool in investigating
hard X-ray characteristics of $gamma$-ray pulsars as faint as 10 mCrab.

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