Abstract Details
| Name: Shasvath Kapadia Affiliation: Inter-University Centre for Astronomy and Astrophysics Conference ID: ASI2025_763 Title : Rates of gravitational-wave sources and properties of their associated GRB counterparts Authors and Co-Authors : Shasvath J. Kapadia, Dimple Panchal, Dhruv Jain, Kuntal Misra, K. G. Arun, L. Resmi Abstract Type : Invited Abstract Category : Plenary Abstract : The synergy of Gravitational-Wave (GW) astronomy with electromagnetic (EM) astronomy promises to answer longstanding questions in astronomy and astrophysics. This talk will provide an interesting and important example involving Gamma-Ray Burst (GRB) counterparts to compact binary coalescences (CBCs). It is known that some, if not all, binary neutron star (BNS) coalescences, and a fraction of neutron - star black hole (NSBH) mergers, produce sufficient mass-ejection to power GRBs. However, this fraction, as well as the distribution of beaming angles of BNS-associated GRBs, are poorly constrained from observation. I will show how, by combining observations of gravitational-waves (GWs) and Gamma-Ray Bursts (GRBs), we can constrain the properties of these CBC associated GRBs. I will first overview how the rate of BNSs and NSBHs can be evaluated from LIGO-Virgo-Kagra (LVK) data. I will then show how Fermi/Swift data, that is post-processed and segregated into BNS- and NSBH- clusters with Machine Learning, can be used to estimate the rate of BNS/NSBH associated GRBs. By comparing the GW rates with the GRB rates, I will demonstrate how we can place constraints on the properties of GRB counterparts to CBCs, viz. the beaming angles of BNS-associated GRBs, and the fraction of NSBHs that produce GRBs. I will conclude by pointing out the caveats of our method. |