Astrophysics Seminar by Suman Bala

Astrophysics Seminar

GRB prompt emission polarimetry with proposed Indian high-energy transient monitor – Daksha

Speaker: Suman Bala (IIT Bombay)

तिथि और समय
कार्यक्रम का स्थान
Library Block Lecture Hall

अमूर्त

Daksha is an ambitious mission, expected to be the most sensitive high-energy time-domain telescope. It is expected to detect the highest number of GRBs and other high-energy transients than any other mission. In addition to the interesting science with fainter and more distant sources, Daksha will also significantly impact the study of bright transients by measuring rapid spectral and temporal variations. A key feature is Daksha's ability to measure X-ray polarisation by utilizing multi-pixel events caused by the Compton scattering of incoming photons. The large effective area, open CZT detectors, and all-sky coverage make Daksha at least an order of magnitude more sensitive than the current generation satellites measuring GRB polarisation. The spectral and temporal analysis of GRB data allows us to identify models that are consistent with data; however, there are degeneracies among the various models. Different models give rise to a different degree of polarisation. A statistical analysis of GRBs' polarisation properties can help us constrain the models. This talk will present Daksha's capability of polarisation measurement and how it will help us probe the physical processes related to GRBs and put constraints on existing models.