Abstract Details

Name: Abhay Kumar
Affiliation: Physical Research Laboratory
Conference ID: ASI2021_509
Title : Exploring Sub-MeV Sensitivity of AstroSat-CZTI for ON-axis bright sources
Authors and Co-Authors : Abhay Kumar (Physical Research Laboratory, Ahmedabad, India), Tanmoy chattopadhyay (Kavli Institute of Astrophysics and Cosmology, 452 Lomita Mall, Stanford, CA 94305, USA), Santosh V vadawale (Physical Research Laboratory, Ahmedabad, India), A.R.Rao (Tata Institute of Fundamental Research, Mumbai, India; Indian Institute of Technology Bombay, Mumbai, India), Soumya Gupta (The Inter-University Centre for Astronomy and Astrophysics, Pune, India), Mithun N.P.S (Physical Research Laboratory, Ahmedabad, India), Varun Bhalerao (Indian Institute of Technology Bombay, Mumbai, India), Dipankar Bhattacharya (The Inter-University Centre for Astronomy and Astrophysics, Pune, India)
Abstract Type : Poster
Abstract Category : Instrumentation and Techniques
Abstract : The Cadmium Zinc Telluride Imager (CZTI) onboard AstroSat is primarily designed for imaging and spectroscopy in the energy range of 20-150 keV. The 5 mm thick CZT detector provides sufficient Compton scattering probability above 100 keV. The Compton energy response of the CZTI can be used for spectroscopy up to 380 keV. Further, it has been observed that about 20% pixels of the CZTI detector plane have low gain, and they are excluded from the primary spectroscopy. With the inclusion of the low gain pixels, the single event and 2-pixel Compton event spectroscopic capability of CZTI can be extended up to 500 keV and further upto 700 keV with better gain calibration. Here we explore the methodology of single and Compton spectroscopy and shows the present calibration status of the CZTI using Crab observations to enhance the spectroscopic sensitivity of CZTI up to the sub-MeV region.