AstroSat-CZTI as a hard X-ray Pulsar Monitor. (arXiv:2101.08650v2 [astro-ph.HE] UPDATED)

AstroSat-CZTI as a hard X-ray Pulsar Monitor. (arXiv:2101.08650v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Anusree_K/0/1/0/all/0/1">K.G. Anusree</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bhattacharya_D/0/1/0/all/0/1">D. Bhattacharya</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rao_A/0/1/0/all/0/1">A.R. Rao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vadawale_S/0/1/0/all/0/1">S. Vadawale</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bhalerao_V/0/1/0/all/0/1">V. Bhalerao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vibhute_A/0/1/0/all/0/1">A. Vibhute</a>

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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