An improved redshift indicator for Gamma-Ray Bursts, based on the prompt emission

Alexandre Pélangeon (1) , Jean-Luc Atteia (1) , Don Q. Lamb (2) , George R. Ricker (3)

1 LATT - Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées
2 Department of Astronomy and Astrophysics [Chicago]
3 CSR - Center for Space Research [Cambridge]

We propose an improved version of the redshift indicator developed by Atteia (2003), which gets rid of the dependence on the burst duration and provides better estimates for high-redshift GRBs. We present the derivation and the definition of this redshift indicator, then its calibration with 17 GRBs with known redshifts detected by HETE-2 and 2 more detected by Konus-Wind. We also provide an estimation of the redshift for 59 bursts, and we finally discuss the redshift distribution of HETE-bursts and the possible other applications of this redshift indicator.

Mots clés: gamma-rays:bursts

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

Alexandre Pélangeon, Jean-Luc Atteia, Don Q. Lamb, George R. Ricker. An improved redshift indicator for Gamma-Ray Bursts, based on the prompt emission. 2006. ⟨hal-00016624⟩