| 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: | Shasvath J. Kapadia, Dimple Panchal, Dhruv Jain, Kuntal Misra, K. G. Arun, L. Resmi |
| Authors Affiliation: | 1 Shasvath J. Kapadia (Inter-University Centre for Astronomy and Astrophysics, Pune - 41107)
2 Dimple Panchal ( Institute for Gravitational Wave Astronomy and School of Physics and Astronomy, University of Birmingham, Birmingham)
3 Dhruv Jain, Kuntal Misra (Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital-263002)
4 K. G. Arun ( Chennai Mathematical Institute, Siruseri, 603103 Tamilnadu)
5 L. Resmi (Indian Institute of Space Science & Technology, Trivandrum 695547) |
| Mode of Presentation: | 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. |
