#TITLE_ALTERNATIVE#

• Main Author: BAGUS PRIAMBODO (NIM : 10309008); Pembimbing : Dr. Premana Wardayanti Premadi, ANDIKA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/17934
• Institution: Institut Teknologi Bandung

Gamma Ray Bursts (GRB) are gamma ray explosion which are interpreted as emitted in jet structure with duration range from 1 milliseconds to 1000 seconds. GRBs became one of the promising standard candles which further than Supernova type Ia, because they are very bright even though many of them located at cosmological distances. However, as the physical mechanism for GRB luminosity indicators that are not yet well undertood, using certain <br /> <br /> <br /> <br /> <br /> empirical relation of the GRB physical parameters in determining luminosity distance still yield large systematic error. By using 27 Swift GRB data, we present the study of luminosity distance calculation using Epeak and redshift as main parameters. Analysis of calculation shows that the error grows larger with increasing redshift, although not in a monotonic manner. This is due to the lack of undertanding on the physical properties of the GRB and also due to the small sample of GRBs at mid to high redshift. Examining the Epeak - Eiso relation or Amati relation and choosing only GRBs which follow the relation reasonably well, and enlarging the sample size would give a better distance redshift relation. By improving the goodness of fit value of spectral energy <br /> <br /> <br /> <br /> <br /> would solve under-estimate problems in determining Eiso and the distance.