• S. VADAWALE

      Articles written in Journal of Astrophysics and Astronomy

    • AstroSat-CZTI as a hard X-ray pulsar monitor

      K. G. ANUSREE D. BHATTACHARYA A. R. RAO S. VADAWALE V. BHALERAO A. VIBHUTE

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      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 $\gamma$-ray characteristics of the c-ray pulsar population. We report highly significant ($\sim$30$\sigma$) detection of hard X-ray (60–380 keV) pulse profile of the Crab pulsar using $\sim$5000 ks of CZTI observations within 5 to 70$^{\circ}$ 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 c-ray pulsars as faint as 10 mCrab.

    • The search for fast transients with CZTI

      Y. SHARMA A. MARATHE V. BHALERAO V. SHENOY G. WARATKAR D. NADELLA P. PAGE P. HEBBAR A. VIBHUTE D. BHATTACHARYA A. R. RAO S. VADAWALE

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      The Cadmium–Zinc–Telluride Imager on AstroSat has proven to be a very effective All-Sky monitor in the hard X-ray regime, detecting over three hundred GRBs and putting highly competitive upper limits on X-ray emissions from gravitational wave sources and fast radio bursts. We present the algorithmsused for searching for such transient sources in CZTI data, and for calculating upper limits in case of nondetections. We introduce CIFT: the CZTI Interface for Fast Transients, a framework used to streamline these processes. We present details of 87 new GRBs detected by this framework that were previously not detected in CZTI.

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      Posted on January 27, 2016

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