We have computed the luminosity rest frame light curves of the first 40 Gamma-Ray Bursts (GRBs) detected by Swift with well-established redshift. We studied average properties of the light curves in the four subsamples of bursts given by z < 1, 1 < z < 2, 2 < z ≲ 4, and z ≳ 4. We conclude that all the last three subsamples share the same morphology and the same luminosity range. Very high redshift (z ≳ 4) GRBs detected up to now are not intrinsically longer than lower redshift long GRBs. Nearby long GRBs (z < 1) are fainter than average. Possible selection effects are under investigation.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)