Gamma-ray burst afterglows: luminosity clustering at infrared wavelengths?

Context. Clustering in the luminosity of the afterglows of gamma-ray burst has been reported in the optical and X-ray. Aims. We investigate the possibility that a clustering in the luminosity of the afterglows of gamma-ray burst exists in the near infrared (J, H, K bands). We use observations of events from 1997 to the end of 2007. Methods. We correct the gamma-ray burst afterglow light curve for distance effects and time dilation, and rescale all light curves to a common distance of z = 1. We used only observations of signals emitted in the near infrared (in the burst frame). Results. We observe a clustering identical to the one observed in the optical and similar to the one observed in X-rays. We thus confirm previous work made in optical wavelengths and set a constraint on the total energy of the fireball.