Abstract Details
| Name: Debdutta Paul Affiliation: Tata Institute of Fundamental Research Conference ID: ASI2018_430 Title : Luminosity function of Gamma Ray Bursts Authors and Co-Authors : Debdutta Paul, A.R. Rao; Tata Institute of Fundamental Research Abstract Type : Contributed Talk Abstract Category : Extragalactic astronomy Abstract : The 'Yonetoku correlation' was first observed for long Gamma Ray Bursts (GRBs), and was used to predict `pseudo-redshifts' of long GRBs detected by BATSE. I have carried out an extensive study of the correlation in both long and short GRBs. In both cases it is shown to predict statistically reliable pseduo-redshift distributions for all the major GRB detectors (BATSE, Fermi and Swift). However, this method does not accurately reproduce the measured redshifts in the case the redshifts are measured, and hence does not permit GRBs to be used as distance-indicators. Using the pseudo-redhifts, we can estimate the luminosities of GRBs without unknown redshifts in a self-consistent manner. This lets one model the `luminosity function' (LF) of GRBs, both for the long and short cases. The models are then used to predict the rate of GRBs detectable by AstroSat-CZTI, and shows that a good fraction of GRBs are still hidden in the data, due to the fact that currently GRB-searches have only been carried out offline, triggered by detection from other satellites. The short GRB LF is used to predict limits on the binary neutron star merger rate detectable by aLIGO/VIRGO. The implications of the study are highlighted in light of the recent detection of GW170817/EM170817. Efforts to make AstroSat-CZTI a major GRB instrument by the next aLIGO/VIRGO observing run are also discussed. |