| Name: Divita Saraogi Affiliation: IIT Bombay Conference ID: ASI2023_564 Title : How robust are polarisation measurements to GRB location? Authors and Co-Authors : Divita Saraogi, Soumya Gupta, Suman Bala, Tanmoy Chattopadhyay, Varun Bhalerao, Dipankar Bhattacharya, Santosh Vadawale Abstract Type : Oral Abstract Category : Extragalactic Astronomy Abstract : Measurements of the polarisation of Gamma Ray Bursts (GRBs) are extremely important for understanding the emission mechanisms, the jet magnetic field, nature and activity of the central engine, etc. The Cadmium Zinc Telluride Imager (CZTI) on board AstroSat has made great strides in the measurement of GRB polarisation. Polarisation measurements utilise a direction-dependent response of the satellite from the satellite mass model. However, not all GRBs are localised well, and the source location can be uncertain by a few degrees. We investigate the impact of these localisation uncertainties on the polarisation measurements by AstroSat. I will demonstrate the effect with specific examples of GRBs, and discuss the implications of this study. |