TITLE: GCN CIRCULAR NUMBER: 6409 SUBJECT: GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum DATE: 07/05/15 08:25:16 GMT FROM: Alexandre Pelangeon at LATT,OMP,Toulouse A. Pelangeon & J-L. Atteia (LATT-OMP) report: We have used the spectral parameters obtained with the Konus spectrum of the bright burst GRB 070512 (Golenetskii et al., GCNC 6408) to compute the spectral pseudo-redshift(**) of this burst localized by the IPN Network. We obtain: pz= 1.39 +/- 0.20 As this redshift estimator is partly based on the Amati relation, we caution that this pseudo-redshift might be wrong if GRB 070512 is a short-hard burst. (**) cf. http://www.ast.obs-mip.fr/grb/pz