Abstract Details
| Name: soumya gupta Affiliation: Homi Bhabha National Institute Conference ID: ASI2024_72 Title : GRB 230307A speectro-polarimetry studies: Evidence of transition from Baryonic to Poynting flux-dominated jet composition Authors and Co-Authors : Soumya Gupta, Rahul Gupta, Tanmoy Chattopadhyay, Dipankar Bhattacharya, A.R. Rao Sunder Sahayanathan, Santosh Vadawale, Varun Bhalerao, Gulab Devangan, Navaneeth PK Abstract Type : Oral Abstract Category : High Energy Phenomena, Fundamental Physics and Astronomy Abstract : GRB 230307A is the second-most brightest long burst found associated with Kilonova emission, providing a unique opportunity to explore the open question on radiation mechanism and jet composition of Gamma-ray bursts (GRBs). In this paper, we examine the temporal, spectral and polarimetric characteristics of the high-energy radiation emitted by GRB 230307A based on prompt emission spectro-polarimetric analysis using joint AstroSat Cadmium Zinc Telluride Imager (CZTI) and Fermi observations. We performed a detailed time-averaged and time-resolved spectro-polarimetric analysis of GRB 230307A and found evidence of the transition from Baryonic to Poynting flux-dominated jet composition within the burst’s duration. The detection of such evolution in spectro-polarimetric properties of a GRB originating from a merger offers new possibilities for characterizing the progenitor’s nature. Additionally, we compared the high-energy properties of GRB 230307A with GRB 211211A and noted that both of these nearby long-Kilonovae-connected bursts have similar temporal morphology, i.e., a hard spike followed by softer emission |