Detecting high-z GRBs is important for constraining the GRB formation rate, and tracing the history of re-ionization and metallicity of the universe. Based on the current sample of GRBs detected by Swift with known redshifts, we investigated the relationship between red-shift, and spectral and temporal characteristics, using the BAT event-by-event data. We found red-shift trends for the peak-flux-normalized temporal width T90, the light curve variance, the peak flux, and the photon index in simple power-law fit to the BAT event data. We have constructed criteria for screening GRBs with high red-shifts. This will enable us to provide a much faster alert to the GRB community of possible high-z bursts.
@article{arxiv.0802.3815,
title = {Screening High-z GRBs with BAT Prompt Emission Properties},
author = {T. N. Ukwatta and T. Sakamoto and M. Stamatikos and N. Gehrels and K. S. Dhuga},
journal= {arXiv preprint arXiv:0802.3815},
year = {2009}
}
Comments
4 pages, 4 figures, to be published in the proceedings of ''Gamma Ray Bursts 2007'', Santa Fe, New Mexico, November 5-9