Abstract Details
| Name: Dhruv Jain Affiliation: Aryabhatta Research Institute of Observational Sciences Conference ID: ASI2025_710 Title : Rates and Beaming Fractions of Gamma Ray Bursts associated with Compact Binary Coalesences Authors and Co-Authors : Shasvath J. Kapadia 1, Dimple 2,3, Dhruv Jain 4, Kuntal Misra 4, K.G. Arun 2, Reshmi Lekshmi 5 Abstract Type : Poster Abstract Category : High Energy Phenomena, Fundamental Physics and Astronomy Abstract : Some, if not all, binary neutron star (BNS) coalescences, and a fraction of neutron - star black hole (NSBH) mergers, are thought to produce sufficient mass-ejection to power Gamma-Ray Bursts (GRBs). However, this fraction, as well as the distribution of beaming angles of BNS-associated GRBs, are poorly constrained from observation. Recent work applied machine learning tools to analyze GRB light curves observed by Fermi/GBM and Swift/BAT. GRBs were segregated into multiple distinct clusters, with the possibility that one of them (BNS cluster) could be associated with BNSs and another (NSBH cluster) with NSBHs. As a proof of principle, assuming that all GRBs detected by Fermi/GBM and Swift/BAT associated with BNSs (NSBHs) lie in the BNS (NSBH) cluster, we estimate their rates. We compare these rates with corresponding BNS and NSBH rates estimated by the LIGO-Virgo-Kagra (LVK) collaboration from the first three observing runs (O1, O2, O3). We find that the BNS rates are consistent with LVK's rate estimates, assuming a uniform distribution of beaming fractions estimated in the literature. Conversely, using the LVK's BNS rate estimates, assuming all BNS mergers produce GRBs, we are able to constrain their beaming angle distribution. We similarly place limits on the fraction of GRB-Bright NSBHs with Fermi/GBM (Swift/BAT) data. |