HETE-2 Observation of two gamma-ray bursts at z > 3

Abstract

GRB 020124 and GRB 030323 constitute half the sample of gamma-ray bursts with a measured redshift greater than 3. This paper presents the temporal and spectral properties of these two gamma-ray bursts detected and localized with HETE-2. While they have nearly identical redshifts (z=3.20 for GRB 020124, and z=3.37 for GRB 030323), these two GRBs span about an order of magnitude in fluence, thus sampling distinct regions of the GRB luminosity function. The properties of these two bursts are compared with those of the bulk of the GRB population detected by HETE-2. We also discuss the energetics of GRB 020124 and GRB 030323 and show that they are compatible with the Epeak - Eiso relation discovered by Amati et al. (2002). Finally, we compute the maximum redshifts at which these bursts could have been detected by HETE-2 and we address various issues connected with the detection and localization of high-z GRBs.

19 pages, 4 figures, submitted to ApJ

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• Discovery of a tight correlation among the prompt emission properties of long Gamma Ray Bursts
• Peak energy of the prompt emission of long Gamma Ray Bursts vs their fluence and peak flux
• Estimating Long GRB Jet Opening Angles and Rest-Frame Energetics
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• Estimating Redshifts for Long Gamma-Ray Bursts
• GRB 221009A and the Apparently Most Energetic Gamma-Ray Bursts